Wittich, W. A. (1958). Audivisual materials: Their nature and use. Harper y Row.
芝加哥风格引文Wittich, Walter A. Audivisual Materials: Their Nature and Use. New York: Harper y Row, 1958.
MLA引文Wittich, Walter A. Audivisual Materials: Their Nature and Use. Harper y Row, 1958.
警告：这些引文格式不一定是100％准确.