Wittich, W. A. (1958). Audivisual materials: Their nature and use. Harper y Row.
Chicago-čujuhus (17. p.)Wittich, Walter A. Audivisual Materials: Their Nature and Use. New York: Harper y Row, 1958.
MLA-čujuhus (9. p.)Wittich, Walter A. Audivisual Materials: Their Nature and Use. Harper y Row, 1958.
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