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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): 729–733. doi:10.1016/j.eururo.2006.01.020. PMID16473458.
Sparling J (1997). "Penile erections: shape, angle, and length". Journal of Sex & Marital Therapy. 23 (3): 195–207. doi:10.1080/00926239708403924. PMID9292834.
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): 54–63. doi:10.1016/j.niox.2006.05.004. PMID16828320.