Reader's Digest Association & Wernert, S. J. (1998). Reader's Digest North American wildlife (Updated ed.). Reader's Digest Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रReader's Digest Association और Susan J. Wernert. Reader's Digest North American Wildlife. Updated ed. Pleasantville, N.Y.: Reader's Digest Association, 1998.
एमएलए (8वां संस्करण) प्रशस्ति पत्रReader's Digest Association और Susan J. Wernert. Reader's Digest North American Wildlife. Updated ed. Reader's Digest Association, 1998.
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