APA (7th ed.) Citation

Gernsback, H., & Moskowitz, S. (1971). Ultimate world. Walker.

Chicago Style (17th ed.) Citation

Gernsback, Hugo, and Sam Moskowitz. Ultimate World. New York: Walker, 1971.

MLA (9th ed.) Citation

Gernsback, Hugo, and Sam Moskowitz. Ultimate World. Walker, 1971.

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