Secondary sources are the published work of scholars specializing in the topic. Secondary sources include scholarly books, articles, and essays (both analyses by contemporary scholars as well as older analyses), surveys, criticism, comparative studies, reference sources, and works on theory and methodology; this is also termed the secondary literature. Eventually you will need to decide which interpretation makes the most sense to you and seems consistent with your primary sources, or if you wish to offer a new interpretation.
When we talk about secondary sources, most of the time we are referring to published scholarship on a subject, rather than supplemental material (bibliographies, encyclopedias, handbooks, etc.). Secondary literature is published in both book form and as articles in periodicals, either in print or digital format. (Digital format includes both reproduction of print material online and original e-text.) This scholarship is analytical and interpretive. It may synthesize the work of other historians to present a totally new interpretation. More likely, it offers a new reading of previously analyzed sources or presents an analysis of previously unknown sources.
Hence, you use secondary sources to identify the main currents of thought on your topic. Which historians have taken up this topic and what were their main arguments? How has our understanding of the subject changed with shifts in the predominant methodologies and theoretical perspectives in the historical profession?
To identify secondary literature, you can search the online library catalog to find books or search article databases and online bibliographies to find journal articles, book chapters, dissertations and more. Some useful article databases for history are:
Covers the history of the world (excluding the United States and Canada) from 1450 to the present, including world history, military history, women's history, history of education, and more. Provides indexing of more than 1,700 academic historical journals in over 40 languages back to 1955. Alternate version: Historical Abstracts with Full Text in the classic EBSCO user interface (best for exporting more than 50 results or combining saved searches).
Index of literature covering the history and culture of the United States and Canada, from prehistory to the present. The database indexes journals from 1964 to present and includes citations and links to book and media reviews. Alternate version: America: History & Life with Full Text in the classic EBSCO user interface (best for exporting more than 50 results or combining saved searches).
Alternate version: Bibliography of Asian Studies in the classic EBSCO user interface (best for exporting more than 50 results or combining saved searches). This on-line version of the Bibliography of Asian Studies (BAS) contains 787,165 records on all subjects (especially in the humanities and the social sciences) pertaining to East, Southeast, and South Asia published worldwide from 1971 to the present... In addition to entries compiled since 1997, the online BAS includes the full data of all of the printed volumes of the BAS issued from the 1971 up to the 1991 volumes (published in 1997)... Through the 1991 printed volume, the BAS included citations to Western-language periodical articles, monographs, chapters in edited volumes, conference proceedings, anthologies, and Festschriften, etc. Monographs published since 1992, however, have not been added to the database, and users seeking such monographs are urged to consult other general resources and databases such as WorldCat.. Use Bibliography of Asian Studies in the NEW EBSCO user interface.
Alternate version: American Bibliography of Slavic, East European and Eurasian Studies in the classic EBSCO user interface (best for exporting more than 50 results or combining saved searches). Covers North American scholarship on East-Central Europe, Russia, and the former Soviet Union. Contains bibliographic records for journal articles, books and book chapters, book reviews, dissertations, online resources, and selected government publications.
Additional suggestions can be found in the research guides created for history classes and special topics.
You can also consult book-length bibliographies, either general overviews such as the American Historical Association Guide to Historical Literature, or specialized bibliographies such as The Harvard Guide to African-American History.
You can use the article databases listed above to look for review essays (also called review articles) in which a historian who specializes in the subject analyzes recent scholarship; you may find helpful overviews that appear as chapters in collections, journal articles, or even monographs by using the keyword historiography or historiographic; you can read about the topic in a subject encyclopedia and look at the bibliography at the end of the entry; and you can find a major work of scholarship on the topic and follow up on the sources used by the author (footnote tracking).
Most of the time you will find the secondary literature you need by using the online catalog, the appropriate article databases, subject encyclopedias or bibliographies, and by consulting your instructor.
Most academic research today is at least somewhat interdisciplinary. For historians, theories and methods are sometimes borrowed from other disciplines such as philosophy, literary criticism, and anthropology.
Furthermore, the publications compiled in the service of other disciplines very often serve as valuable source material for historians.
Check these links for helpful introductions to research resources for related disciplines:
African American Research Center
Online Resources for Religious Studies
Philosophy Library Resource Guide
Social Sciences, Health, and Education Library (SSHEL):
International and Area Studies Library
Literatures and Languages Library (includes Classics Collection)
Music and Performing Arts Library