Dyfyniad APA

Wittich, W. A., & Schuller, C. F. (1957). Audio-visual materials: Their nature and use (2a. ed.). Harper & Brothers.

Dyfyniad Arddull Chicago

Wittich, Walter Arno, and Charles Francis Schuller. Audio-visual Materials: Their Nature and Use. 2a. ed. Nueva York: Harper & Brothers, 1957.

Dyfyniad MLA

Wittich, Walter Arno, and Charles Francis Schuller. Audio-visual Materials: Their Nature and Use. 2a. ed. Harper & Brothers, 1957.

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