APA (7th ed.) Citation

Gardner, I. C. (1940). Charts for testing lens resolution. U.S. Govt. print. off.

Chicago Style (17th ed.) Citation

Gardner, Irvine C. Charts for Testing Lens Resolution. Washington: U.S. Govt. print. off, 1940.

MLA (9th ed.) Citation

Gardner, Irvine C. Charts for Testing Lens Resolution. U.S. Govt. print. off, 1940.

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