Hornstein, Theresa; Schwerin, Jeri. Biology Of Women 5th. Cengage Learning. Jan 1, 2012: 62–63 of 816 [17 March 2015]. ISBN 9781285401027. (原始内容存档于2019-04-19).
Hornstein, Theresa; Schwerin, Jeri. Biology Of Women 5th. Cengage Learning. Jan 1, 2012: 62–63 of 816 [17 March 2015]. ISBN 9781285401027. (原始内容存档于2019-04-19).