H. Wessells. Penile length in the flaccid and erect states: Guidelines for penile augmentation. „The Journal of urology”. 156 (3), s. 995–997, 1996. DOI: 10.1016/S0022-5347(01)65682-9. PMID: 8709382. (ang.).
J. Chen, A. Gefen, A. Greenstein, H. Matzkin i inni. Predicting penile size during erection. „International Journal of Impotence Research”, s. 328–333, 2000. DOI: 10.1038/sj.ijir.3900627. PMID: 11416836. (ang.).
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H. Wessells. Penile length in the flaccid and erect states: Guidelines for penile augmentation. „The Journal of urology”. 156 (3), s. 995–997, 1996. DOI: 10.1016/S0022-5347(01)65682-9. PMID: 8709382. (ang.).
J. Chen, A. Gefen, A. Greenstein, H. Matzkin i inni. Predicting penile size during erection. „International Journal of Impotence Research”, s. 328–333, 2000. DOI: 10.1038/sj.ijir.3900627. PMID: 11416836. (ang.).