APA

Wittich W., Schuller C. F. j. a., . (1953). Audio-visual materials. New York: Harper.

Chicago

Wittich W.A, Schuller Charles Francis jt au, . 1953. Audio-visual materials. New York: Harper.

Harvard

Wittich W., Schuller C. F. j. a., . (1953). Audio-visual materials. New York: Harper.

MLA

Wittich W.A, Schuller Charles Francis jt au, . Audio-visual materials. New York: Harper. 1953.