Apel, W. (1958). Gregorian chant. Burns, Oates & Washbourne.
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芝加哥风格引文
Apel, Willi. Gregorian Chant. London: Burns, Oates & Washbourne, 1958.
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MLA引文
Apel, Willi. Gregorian Chant. Burns, Oates & Washbourne, 1958.
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警告：这些引文格式不一定是100％准确.