APA (7th ed.) Citation

Olsen, J. (1968). Cassius Clay / Jack Olsen. Spehre.

Chicago Style (17th ed.) Citation

Olsen, Jack. Cassius Clay / Jack Olsen. [London]: Spehre, 1968.

MLA (9th ed.) Citation

Olsen, Jack. Cassius Clay / Jack Olsen. Spehre, 1968.

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