Hengen, N. L. (1997). In pursuit of compassion: A centennial history of the Spokane Humane Society, 1897-1997. Spokane Humane Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHengen, Nona L. In Pursuit of Compassion: A Centennial History of the Spokane Humane Society, 1897-1997. Spokane, Wash.: Spokane Humane Society, 1997.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHengen, Nona L. In Pursuit of Compassion: A Centennial History of the Spokane Humane Society, 1897-1997. Spokane Humane Society, 1997.
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