APA Edition Citation

Asimov, I., Dozois, G. R., & Williams, S. (1999). Isaac Asimov's valentines (Ace ed.). Ace Books.

Chicago Edition Citation

Asimov, Isaac, Gardner R. Dozois, and Sheila Williams. Isaac Asimov's Valentines. Ace ed. New York: Ace Books, 1999.

MLA Edition Citation

Asimov, Isaac, et al. Isaac Asimov's Valentines. Ace ed. Ace Books, 1999.