APA (7th ed.) Citation

Asimov, I. (1977). The collapsing universe. Walker.

Chicago Style (17th ed.) Citation

Asimov, Isaac. The Collapsing Universe. New York: Walker, 1977.

MLA (9th ed.) Citation

Asimov, Isaac. The Collapsing Universe. Walker, 1977.

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