APA (7th ed.) Citation

Gamow, G. (1944). Mr. Tompkins explores the atom. The Macmillan company; The University press.

Chicago Style (17th ed.) Citation

Gamow, George. Mr. Tompkins Explores the Atom. New York, Cambridge [Eng.]: The Macmillan company; The University press, 1944.

MLA (8th ed.) Citation

Gamow, George. Mr. Tompkins Explores the Atom. The Macmillan company; The University press, 1944.