APA aipamena

McKown, H. C., & Roberts, A. B. (1949). Audio-visual aids to instruction (2nd ed.). McGraw Hill.

Chicago Style aipamena

McKown, Harry C., and Alvin B. Roberts. Audio-visual Aids to Instruction. 2nd ed. New York: McGraw Hill, 1949.

MLA aipamena

McKown, Harry C., and Alvin B. Roberts. Audio-visual Aids to Instruction. 2nd ed. McGraw Hill, 1949.