APA (7th ed.) Citation

Asimov, I. (1986). Foundation and earth. Grafton Books.

Chicago Style (17th ed.) Citation

Asimov, Isaac. Foundation and Earth. London u.a: Grafton Books, 1986.

MLA (9th ed.) Citation

Asimov, Isaac. Foundation and Earth. Grafton Books, 1986.

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