Guide to Library Research in Music by
Explains the research process, offers instruction in searching techniques and library-based organizational systems, and introduces an array of electronic and print music resources.
Music Library and Research Skills by 
Music in Words by
A textbook and reference book "about the way we research music and write about it." Graduate student level.
Writing about Music by
Another text on preparing written documents about music.
Music Research by
Clear, concise, and practical, the third edition of Music Research: A Handbook introduces students to the major print and electronic research tools available today. With a strong focus on the connection between music and writing, this comprehensive guide is ideal for use in both undergraduateand graduate music courses that require students to engage in library research or to write research papers.
Sourcebook for Research in Music by 
Music Reference and Research Materials by
Though dated, this "classic" guide to materials on music is still useful, particularly for older print sources. Lists and describes dictionaries, encyclopedias, bibliographies, discographies, histories, and many others.