R. Baselt, Disposition of Toxic Drugs and Chemicals in Man, 9th edition, Biomedical Publications, Seal Beach, CA, 2011, pp. 1552–53. „Sildenafil”(PDF). Biomedical Publications. Arhivat din original(PDF) la . Accesat în .
Deveci S, Peșkircioğlu L, Aygün C, Tekin MI, Dirim A, Ozkardeș H (noiembrie 2004). „Sublingual sildenafil in the treatment of erectile dysfunction: faster onset of action with less dose”. International Journal of Urology. 11 (11): 989–92. doi:10.1111/j.1442-2042.2004.00933.x. PMID15509203.
Deveci S, Peșkircioğlu L, Aygün C, Tekin MI, Dirim A, Ozkardeș H (noiembrie 2004). „Sublingual sildenafil in the treatment of erectile dysfunction: faster onset of action with less dose”. International Journal of Urology. 11 (11): 989–92. doi:10.1111/j.1442-2042.2004.00933.x. PMID15509203.
R. Baselt, Disposition of Toxic Drugs and Chemicals in Man, 9th edition, Biomedical Publications, Seal Beach, CA, 2011, pp. 1552–53. „Sildenafil”(PDF). Biomedical Publications. Arhivat din original(PDF) la . Accesat în .