APA (7th ed.) Citation

Asimov, I. (1987). Foundation and earth. Grafton Books.

Chicago Style (17th ed.) Citation

Asimov, Isaac. Foundation and Earth. London: Grafton Books, 1987.

MLA (8th ed.) Citation

Asimov, Isaac. Foundation and Earth. Grafton Books, 1987.

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