Apel, Willi, 1893-1988. Harvard dictionary of music. - 2d ed., rev. and enl. - Cambridge, Mass., Belknap Press of Harvard University Press, 1969. - xv, 935 p. illus., music. 26 cm. Restricted to musical topics, omitting biographical articles. Includes bibliographies. ISBN: 0674375017 LCCN: 68021970 Subjects--Topical Terms: Music--Dictionaries. LC Class. No.: ML100 / .A64 1969