APA (7th ed.) Citation

Gamow, G. (1965). A planet called earth. Macmillan.

Chicago Style (17th ed.) Citation

Gamow, George. A Planet Called Earth. London: Macmillan, 1965.

MLA (9th ed.) Citation

Gamow, George. A Planet Called Earth. Macmillan, 1965.

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