Helfer, R. (1998). Modoc: The true story of the greatest elephant that ever lived (1st HarperPerennial ed.). HarperPerennial.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHelfer, Ralph. Modoc: The True Story of the Greatest Elephant That Ever Lived. 1st HarperPerennial ed. New York: HarperPerennial, 1998.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHelfer, Ralph. Modoc: The True Story of the Greatest Elephant That Ever Lived. 1st HarperPerennial ed. HarperPerennial, 1998.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.