U.S. Library of Congress. Subject Cataloging Division, Gale Research Inc, Runchock, R., & Droste, K. (1989). Class M. Music and books on music: Library of Congress classification schedules combined with additions and changes through 1988. Gale Research Inc.
Cita Chicago (17th ed.)U.S. Library of Congress. Subject Cataloging Division, Gale Research Inc, Rita Runchock, i Kathleen Droste. Class M. Music and Books on Music: Library of Congress Classification Schedules Combined with Additions and Changes Through 1988. Detroit, Michigan: Gale Research Inc, 1989.
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