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^Heide Schatten and Gheorghe M. Constantinescu, Comparative Reproductive Biology, page 17, John Wiley & Sons, 2008, ISBN978-0-470-39025-2
^Genaro Andres Contreras, The Use of Tylosin to Treat Intramammary Infections , page 22, ProQuest, 2008, ISBN978-0-549-60762-5
^Olufunmilayo I. Olopade and Carla I. Falkson, Breast Cancer in Women of African Descent, page 125, Springer Science & Business Media, 2010, ISBN9781402036644
^Keith L. Moore, Anne M.R. Agur and Arthur F. Daley, Essential Clinical Anatomy (4th edition), page 49, Lippincott Williams and Wilkins, 2010, ISBN9780781799157