APA (7th ed.) Citation

Ploger, R. R. U.S. Army engineers, 1965-1970.

Chicago Style (17th ed.) Citation

Ploger, Robert R. U.S. Army Engineers, 1965-1970.

MLA (9th ed.) Citation

Ploger, Robert R. U.S. Army Engineers, 1965-1970.

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