APA引文

Apel, W. (1958). Gregorian chant. Indiana University Press.

芝加哥风格引文

Apel, Willi. Gregorian Chant. Bloomington: Indiana University Press, 1958.

MLA引文

Apel, Willi. Gregorian Chant. Indiana University Press, 1958.

警告：这些引文格式不一定是100％准确.