APA (7th ed.) Citation

Humphrey, R. E. (2008). Once upon a time in war: The 99th division in World War II. University of Oklahoma Press.

Chicago Style (17th ed.) Citation

Humphrey, Robert E. Once upon a Time in War: The 99th Division in World War II. Norman: University of Oklahoma Press, 2008.

MLA (9th ed.) Citation

Humphrey, Robert E. Once upon a Time in War: The 99th Division in World War II. University of Oklahoma Press, 2008.