APA (7th ed.) Citation

Touponce, W. F. (1991). Isaac Asimov (1. publ.). Twayne.

Chicago Style (17th ed.) Citation

Touponce, William F. Isaac Asimov. 1. publ. Boston: Twayne, 1991.

MLA (9th ed.) Citation

Touponce, William F. Isaac Asimov. 1. publ. Twayne, 1991.

Warning: These citations may not always be 100% accurate.