Wittich, W. A., & Schuller, C. F. (1973). Instructional technology: Its nature and use (5th ed.). Harper & Row.
Čikaški stil citiranja (17. izdanje)Wittich, Walter Arno, i Charles Francis Schuller. Instructional Technology: Its Nature and Use. 5th ed. New York: Harper & Row, 1973.
MLA način citiranja (8. izdanje)Wittich, Walter Arno, i Charles Francis Schuller. Instructional Technology: Its Nature and Use. 5th ed. Harper & Row, 1973.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.