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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Fennell, 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.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Fennell, 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.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.