Citazione Stile APA (7a Edizione)

Guion, D. W. (1918). Some o' these days: Darkey spirituals. M. Witmark.

Citazione stile Chigago Style (17a edizione)

Guion, David W. Some O' These Days: Darkey Spirituals. New York: M. Witmark, 1918.

Citatione MLA (9a ed.)

Guion, David W. Some O' These Days: Darkey Spirituals. M. Witmark, 1918.