The Undergraduate Library here at the University of Illinois at Urbana-Champaign has a guide that can help you find and use various citation managers, learn more about each citation style, as well as help you avoid plagiarism. You can find it here.
The Writing Center at the University of Illinois at Urbana-Champaign offers a Writers Workshop that can assist you with the writing process. You can find more information about the Writers Workshop here or book an appointment here. These services are open to all undergraduate and graduate students, staff, post-doctorates, and faculty. Please schedule in advance, but walk-in appointments are available.
Western University in Ontario has a guide that can help you specifically with the citation of music scores in the Chicago style. It can be found here.
Purdue's Online Writing Lab also features a guide that can help you with grammar and the writing process, as well as with writing citations in many different styles, as well as many other topics.
This guide was written by Thom Jencks, MPAL Graduate Assistant in Spring of 2019.