As you are searching the article databases to the right, you will find research in a broad range of journals. The following titles are some of the top in the field:
Children's Literature is a field that attracts researchers from numerous disciplines, including not just literature but the information sciences, education, and history. You will likely need to search in disciplinary databases for each of these fields to find relevant articles, as well as the library catalog for books in the field.
Scholars in humanities disciplines like literature and history often publish their most important work in monographs (books on specialized topics, usually by a single author). You will want to search the library catalog and beyond for these works as well as collected essays on children's literature.
You can search for research on particular titles or authors using the keyword search, but you can also use the term "children's literature" as a subject search. The subheading "history and criticism" can be included in that or left off.