APA (7th ed.) Citation

Greenberg, M. H., & Helfers, J. (2004). Space stations. DAW Books.

Chicago Style (17th ed.) Citation

Greenberg, Martin Harry, and John Helfers. Space Stations. New York: DAW Books, 2004.

MLA (9th ed.) Citation

Greenberg, Martin Harry, and John Helfers. Space Stations. DAW Books, 2004.