APA (7th ed.) Citation

Delany, S. R., & Freas, K. (1970). The fall of the towers: A classic science fiction trilogy. Ace Books.

Chicago Style (17th ed.) Citation

Delany, Samuel R., and Kelly Freas. The Fall of the Towers: A Classic Science Fiction Trilogy. New York: Ace Books, 1970.

MLA (9th ed.) Citation

Delany, Samuel R., and Kelly Freas. The Fall of the Towers: A Classic Science Fiction Trilogy. Ace Books, 1970.