APA (7th ed.) Citation

Asimov, I. (1978). The collapsing universe. Pocket Books.

Chicago Style (17th ed.) Citation

Asimov, Isaac. The Collapsing Universe. New York: Pocket Books, 1978.

MLA (9th ed.) Citation

Asimov, Isaac. The Collapsing Universe. Pocket Books, 1978.

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