Perelman, Michael A. (2001). "Integrating Sildenafil and Sex Therapy: Unconsummated Marriage Secondary to Erectile Dysfunction and Retarded Ejaculation". Journal of Sex Education and Therapy. 26 (1): 13–21. doi:10.1080/01614576.2001.11074377. S2CID141603559.
Perelman, Michael A. (2001). "Integrating Sildenafil and Sex Therapy: Unconsummated Marriage Secondary to Erectile Dysfunction and Retarded Ejaculation". Journal of Sex Education and Therapy. 26 (1): 13–21. doi:10.1080/01614576.2001.11074377. S2CID141603559.