Cita APA (7a ed.)

Nye, J. L. (1999). Twice upon a time. Daw Books.

Cita Chicago Style (17a ed.)

Nye, Jody Lynn. Twice upon a Time. New York: Daw Books, 1999.

Cita MLA (9a ed.)

Nye, Jody Lynn. Twice upon a Time. Daw Books, 1999.