APA (7th ed.) Citation

Heinlein, R. A., & Haldeman, J. W. (1978). Double star. Gregg Press.

Chicago Style (17th ed.) Citation

Heinlein, Robert A., and Joe W. Haldeman. Double Star. Boston: Gregg Press, 1978.

MLA (9th ed.) Citation

Heinlein, Robert A., and Joe W. Haldeman. Double Star. Gregg Press, 1978.