Cita APA (7a ed.)

Gunn, J. E. (1964). Future imperfect. Bantam Books.

Cita Chicago Style (17a ed.)

Gunn, James E. Future Imperfect. New York: Bantam Books, 1964.

Cita MLA (9a ed.)

Gunn, James E. Future Imperfect. Bantam Books, 1964.