APA (7th ed.) Citation

Johnson, D. A., & Glenn, W. H. (1960). Understanding numeration systems. Webster.

Chicago Style (17th ed.) Citation

Johnson, Donovan A., and William H. Glenn. Understanding Numeration Systems. Saint Louis: Webster, 1960.

MLA (9th ed.) Citation

Johnson, Donovan A., and William H. Glenn. Understanding Numeration Systems. Webster, 1960.