Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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