APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.