Stein, Michael D.; Freedberg, Kenneth A.; Sullivan, Lisa M.; Savetsky, Jacqueline; Levenson, Suzette M.; Hingson, Ralph; Samet, Jeffrey H. Sexual Ethics. Archives of Internal Medicine. 1998-02-09, 158 (3): 253. ISSN 0003-9926. doi:10.1001/archinte.158.3.253(英语).
Stein, Michael D.; Freedberg, Kenneth A.; Sullivan, Lisa M.; Savetsky, Jacqueline; Levenson, Suzette M.; Hingson, Ralph; Samet, Jeffrey H. Sexual Ethics. Archives of Internal Medicine. 1998-02-09, 158 (3): 253. ISSN 0003-9926. doi:10.1001/archinte.158.3.253(英语).
Stein, Michael D.; Freedberg, Kenneth A.; Sullivan, Lisa M.; Savetsky, Jacqueline; Levenson, Suzette M.; Hingson, Ralph; Samet, Jeffrey H. Sexual Ethics. Archives of Internal Medicine. 1998-02-09, 158 (3): 253. ISSN 0003-9926. doi:10.1001/archinte.158.3.253(英语).