APA (7th ed.) Citation

Hamilton, W. H., Batzell, E. E., Bittker, B. I., & Kohn, H. (1941). Patents and free enterprise. [publisher not identified].

Chicago Style (17th ed.) Citation

Hamilton, Walton Hale, Elmer E. Batzell, Boris I. Bittker, and Henry Kohn. Patents and Free Enterprise. [Washington]: [publisher not identified], 1941.

MLA (8th ed.) Citation

Hamilton, Walton Hale, et al. Patents and Free Enterprise. [publisher not identified], 1941.