Cita APA (7a ed.)

Waltari, M., & Walford, N. (1957). The dark angel. Pocket Books.

Cita Chicago Style (17a ed.)

Waltari, Mika, y Naomi Walford. The Dark Angel. New York: Pocket Books, 1957.

Cita MLA (9a ed.)

Waltari, Mika, y Naomi Walford. The Dark Angel. Pocket Books, 1957.