F.F.ColomboF.F., O.O.FeniceO.O., E.E.AustoniE.E., [NPT: nocturnal penile tumescence test], „Archivio Italiano Di Urologia, Andrologia: Organo Ufficiale [di] Societa Italiana Di Ecografia Urologica E Nefrologica”, 66 (4), 1994, s. 159–164, ISSN1124-3562, PMID: 7951352 [dostęp 2021-02-26].
GraceG.DoreyGraceG. i inni, Randomised controlled trial of pelvic floor muscle exercises and manometric biofeedback for erectile dysfunction, „The British Journal of General Practice”, 54 (508), 2004, s. 819–825, ISSN0960-1643, PMID: 15527607, PMCID: PMC1324914 [dostęp 2021-02-26].
F.F.ColomboF.F., O.O.FeniceO.O., E.E.AustoniE.E., [NPT: nocturnal penile tumescence test], „Archivio Italiano Di Urologia, Andrologia: Organo Ufficiale [di] Societa Italiana Di Ecografia Urologica E Nefrologica”, 66 (4), 1994, s. 159–164, ISSN1124-3562, PMID: 7951352 [dostęp 2021-02-26].
GraceG.DoreyGraceG. i inni, Randomised controlled trial of pelvic floor muscle exercises and manometric biofeedback for erectile dysfunction, „The British Journal of General Practice”, 54 (508), 2004, s. 819–825, ISSN0960-1643, PMID: 15527607, PMCID: PMC1324914 [dostęp 2021-02-26].