Cita APA

Hirschberg, D. 1. (1949). Duets are fun. New York: Musicord Publications.

Citación estilo Chicago

Hirschberg, David 1899-. Duets Are Fun. New York: Musicord Publications, 1949.

Cita MLA

Hirschberg, David 1899-. Duets Are Fun. New York: Musicord Publications, 1949.