Fennell, J. (2005). The seven ages of man's best friend: A comprehensive guide for caring for your dog through all the stages of life (1st U.S. ed.). Collins.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFennell, Jan. The Seven Ages of Man's Best Friend: A Comprehensive Guide for Caring for Your Dog Through All the Stages of Life. 1st U.S. ed. New York: Collins, 2005.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFennell, Jan. The Seven Ages of Man's Best Friend: A Comprehensive Guide for Caring for Your Dog Through All the Stages of Life. 1st U.S. ed. Collins, 2005.
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