Oliver, Reeba; Thakar, Ranee; Sultan, Abdul H. (June 2011). "The history and usage of the vaginal pessary: a review". European Journal of Obstetrics & Gynecology and Reproductive Biology. 156 (2): 125–130. doi:10.1016/j.ejogrb.2010.12.039. ISSN0301-2115. PMID21255901.
Oliver, Reeba; Thakar, Ranee; Sultan, Abdul H. (June 2011). "The history and usage of the vaginal pessary: a review". European Journal of Obstetrics & Gynecology and Reproductive Biology. 156 (2): 125–130. doi:10.1016/j.ejogrb.2010.12.039. ISSN0301-2115. PMID21255901.
Oliver, Reeba; Thakar, Ranee; Sultan, Abdul H. (June 2011). "The history and usage of the vaginal pessary: a review". European Journal of Obstetrics & Gynecology and Reproductive Biology. 156 (2): 125–130. doi:10.1016/j.ejogrb.2010.12.039. ISSN0301-2115. PMID21255901.