Citazione Stile APA (7a Edizione)

Drooyan, I., & Hadel, W. (1964). A programmed introduction to number systems. Wiley.

Citazione stile Chigago Style (17a edizione)

Drooyan, Irving, e Walter Hadel. A Programmed Introduction to Number Systems. New York: Wiley, 1964.

Citatione MLA (9a ed.)

Drooyan, Irving, e Walter Hadel. A Programmed Introduction to Number Systems. Wiley, 1964.