Schull, W. J. (1990). Song among the ruins. Cambridge, Mass: Harvard University Press.
Trích dẫn kiểu ChicagoSchull, Willaim J. Song Among the Ruins. Cambridge, Mass: Harvard University Press, 1990.
Deismireacht MLASchull, Willaim J. Song Among the Ruins. Cambridge, Mass: Harvard University Press, 1990.
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