The Purdue OWL is a free, online resource with in-depth formatting and style guides (in-text and in bibliographies/works cited) for three major citation styles. Particularly useful for citing unusual stuff like websites, interviews, or presentations. ALSO shows how to properly insert tables, graphs, headings, and more. This website will not have examples and explanations specific to music: see the resources below.
There are many guides to copyright laws and resources. Two that you should be aware of are the copyright guidelines for Luther College and the resources available from the Music Library Association.
If you are in doubt about how to cite musical works, format musical examples, or just want some tips on how to write effectively about music, these books will help you out.
There are many ways to keep track of citations for research, including file management tools in many of our databases. Here are some other helpful tools.