Wittich, W. A. (1953). Audio-visual materials: Their nature and use. Harper and Brothers.
芝加哥风格引文Wittich, Walter Arno. Audio-visual Materials: Their Nature and Use. Harper and Brothers, 1953.
MLA引文Wittich, Walter Arno. Audio-visual Materials: Their Nature and Use. Harper and Brothers, 1953.
警告：这些引文格式不一定是100％准确.