Willis, J. R. (1976). Fragments of American Life: An Exhibition of Paintings / John Ralph Willis. Art Museum.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWillis, John Ralph. Fragments of American Life: An Exhibition of Paintings / John Ralph Willis. Princeton: Art Museum, 1976.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWillis, John Ralph. Fragments of American Life: An Exhibition of Paintings / John Ralph Willis. Art Museum, 1976.
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