Cita APA (7a ed.)

Ackerman, R. W. (1966). Backgrounds to medieval English literature. Random House.

Cita Chicago Style (17a ed.)

Ackerman, Robert W. Backgrounds to Medieval English Literature. New York: Random House, 1966.

Cita MLA (9a ed.)

Ackerman, Robert W. Backgrounds to Medieval English Literature. Random House, 1966.