Library of Congress. Music Division & Herbert, R. (1986). Gregorian chant sources in the collections of the Music Division of the Library of Congress. The Division.
Chicago Style (17th ed.) CitationLibrary of Congress. Music Division and Rembert Herbert. Gregorian Chant Sources in the Collections of the Music Division of the Library of Congress. [Washington, D.C.]: The Division, 1986.
MLA (9th ed.) CitationLibrary of Congress. Music Division and Rembert Herbert. Gregorian Chant Sources in the Collections of the Music Division of the Library of Congress. The Division, 1986.
Warning: These citations may not always be 100% accurate.