APA (7th ed.) Citation

Keys, W. J., & Powell, C. H. (1970). A handbook of modern keypunch operation. Canfield Press.

Chicago Style (17th ed.) Citation

Keys, William J., and Carl H. Powell. A Handbook of Modern Keypunch Operation. San Francisco: Canfield Press, 1970.

MLA (9th ed.) Citation

Keys, William J., and Carl H. Powell. A Handbook of Modern Keypunch Operation. Canfield Press, 1970.