Cita APA (7a ed.)

Heinlein, R. A. (1986). The door into summer. Ballantine Books.

Cita Chicago Style (17a ed.)

Heinlein, Robert Anson. The Door into Summer. New York: Ballantine Books, 1986.

Cita MLA (9a ed.)

Heinlein, Robert Anson. The Door into Summer. Ballantine Books, 1986.