Folk music:
a selection of folk songs, ballads, dances, instrumental pieces, and folk tales of the United States and Latin America; catalog of phonograph records.
APA Citation
Library of Congress. Music Division. (1959). Folk music: a selection of folk songs, ballads, dances, instrumental pieces, and folk tales of the United States and Latin America; catalog of phonograph records. [Washington]: Music Division, Recording Laboratory, Reference Dept., Library of Congress.
MLA Citation
Library of Congress. Music Division. Folk Music: a Selection of Folk Songs, Ballads, Dances, Instrumental Pieces, And Folk Tales of the United States And Latin America; Catalog of Phonograph Records. [Washington]: Music Division, Recording Laboratory, Reference Dept., Library of Congress, 1959.
Warning: These citations may not always be complete (especially for serials).