Citazione Stile APA (7a Edizione)

Wittich, W. A., & Schuller, C. F. (1973). Instructional technology: Its nature and use (5th ed.). Harper & Row.

Citazione stile Chigago Style (17a edizione)

Wittich, Walter Arno, e Charles Francis Schuller. Instructional Technology: Its Nature and Use. 5th ed. New York: Harper & Row, 1973.

Citatione MLA (8a ed.)

Wittich, Walter Arno, e Charles Francis Schuller. Instructional Technology: Its Nature and Use. 5th ed. Harper & Row, 1973.