Cita APA (7a ed.)

Frey, H. (1924). A Collection of 25 selected famous Negro spirituals. Robbins.

Cita Chicago Style (17a ed.)

Frey, Hugo. A Collection of 25 Selected Famous Negro Spirituals. New York: Robbins, 1924.

Cita MLA (8a ed.)

Frey, Hugo. A Collection of 25 Selected Famous Negro Spirituals. Robbins, 1924.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.