APA (7th ed.) Citation

Asimov, I. (1971). Four futures: Four original novellas of science fiction. Hawthorn Books.

Chicago Style (17th ed.) Citation

Asimov, Isaac. Four Futures: Four Original Novellas of Science Fiction. New York: Hawthorn Books, 1971.

MLA (9th ed.) Citation

Asimov, Isaac. Four Futures: Four Original Novellas of Science Fiction. Hawthorn Books, 1971.