APA (7th ed.) Citation

Heinlein, R. A., & Hunter, M. (1957). The door into summer (First edition.). Doubleday & Company, Inc..

Chicago Style (17th ed.) Citation

Heinlein, Robert A., and Mel Hunter. The Door into Summer. First edition. Garden City, New York: Doubleday & Company, Inc., 1957.

MLA (9th ed.) Citation

Heinlein, Robert A., and Mel Hunter. The Door into Summer. First edition. Doubleday & Company, Inc., 1957.