Mulhall, John P.; Incrocci, Luca; Goldstein, Irwin; Rosen, Ray (23 de abril de 2011). Cancer and Sexual Health. EUA: Springer Science & Business Media. p. 17. ISBN9781607619161
Hornstein, Theresa; Schwerin, Jeri (1 de janeiro de 2012). Biology Of Women 5 ed. EUA: Cengage Learning. pp. 62–63 de 816. ISBN9781285401027. Consultado em 17 de março de 2015
Evans, James Warren (15 de fevereiro de 1990). The Horse. EUA: W. H. Freeman. ISBN978-0-7167-1811-6. Consultado em 22 de julho de 2013
colostate.edu
arbl.cvmbs.colostate.edu
«Semen Collection from Dogs». Arbl.cvmbs.colostate.edu. 14 de setembro de 2002. Consultado em 29 de janeiro de 2012. Arquivado do original em 5 de fevereiro de 2012
Sparling J (1997). «Penile erections: shape, angle, and length». Journal of Sex & Marital Therapy. 23 (3). pp. 195–207. PMID9292834. doi:10.1080/00926239708403924
Li CY; Kayes O; Kell PD; Christopher N; Minhas S; Ralph DJ (2006). «Penile suspensory ligament division for penile augmentation: indications and results». Eur. Urol. 49 (4). pp. 729–733. PMID16473458. doi:10.1016/j.eururo.2006.01.020
Sadeghipour H; Ghasemi M; Ebrahimi F; Dehpour AR (2007). «Effect of lithium on endothelium-dependent and neurogenic relaxation of rat corpus cavernosum: role of nitric oxide pathway». Nitric Oxide. 16 (1). pp. 54–63. PMID16828320. doi:10.1016/j.niox.2006.05.004
Sadeghipour H; Ghasemi M; Nobakht M; Ebrahimi F; Dehpour AR (2007). «Effect of chronic lithium administration on endothelium-dependent relaxation of rat corpus cavernosum: the role of nitric oxide and cyclooxygenase pathways». BJU Int. 99 (1). pp. 177–182. PMID17034495. doi:10.1111/j.1464-410X.2006.06530.x
Sparling J (1997). «Penile erections: shape, angle, and length». Journal of Sex & Marital Therapy. 23 (3). pp. 195–207. PMID9292834. doi:10.1080/00926239708403924
Li CY; Kayes O; Kell PD; Christopher N; Minhas S; Ralph DJ (2006). «Penile suspensory ligament division for penile augmentation: indications and results». Eur. Urol. 49 (4). pp. 729–733. PMID16473458. doi:10.1016/j.eururo.2006.01.020
Sadeghipour H; Ghasemi M; Ebrahimi F; Dehpour AR (2007). «Effect of lithium on endothelium-dependent and neurogenic relaxation of rat corpus cavernosum: role of nitric oxide pathway». Nitric Oxide. 16 (1). pp. 54–63. PMID16828320. doi:10.1016/j.niox.2006.05.004
Sadeghipour H; Ghasemi M; Nobakht M; Ebrahimi F; Dehpour AR (2007). «Effect of chronic lithium administration on endothelium-dependent relaxation of rat corpus cavernosum: the role of nitric oxide and cyclooxygenase pathways». BJU Int. 99 (1). pp. 177–182. PMID17034495. doi:10.1111/j.1464-410X.2006.06530.x
«Semen Collection from Dogs». Arbl.cvmbs.colostate.edu. 14 de setembro de 2002. Consultado em 29 de janeiro de 2012. Arquivado do original em 5 de fevereiro de 2012