Higgs, P. J. (1931). Special exhibition of the lost Peruzzi Madonna by Raphael.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHiggs, Peercy Jackson. Special Exhibition of the Lost Peruzzi Madonna by Raphael. New York?, 1931.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHiggs, Peercy Jackson. Special Exhibition of the Lost Peruzzi Madonna by Raphael. 1931.
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