Sundberg, John P.; Booth, Carmen J.; Nanney, Lillian B.; Fleckman, Philip; King, Lloyd E. (2018-01-01), Treuting, Piper M.; Dintzis, Suzanne M.; Montine, Kathleen S. (eds.), "24 - Skin and Adnexa", Comparative Anatomy and Histology (Second Edition), San Diego: Academic Press, pp. 511–542, doi:10.1016/b978-0-12-802900-8.00024-5, ISBN978-0-12-802900-8, retrieved 2020-10-22
Sundberg, John P.; Booth, Carmen J.; Nanney, Lillian B.; Fleckman, Philip; King, Lloyd E. (2018-01-01), Treuting, Piper M.; Dintzis, Suzanne M.; Montine, Kathleen S. (eds.), "24 - Skin and Adnexa", Comparative Anatomy and Histology (Second Edition), San Diego: Academic Press, pp. 511–542, doi:10.1016/b978-0-12-802900-8.00024-5, ISBN978-0-12-802900-8, retrieved 2020-10-22