Prota G, Hu DN, Vincensi MR, McCormick SA, Napolitano A; Hu; Vincensi; McCormick; Napolitano (1998). «Characterization of melanins in human irides and cultured uveal melanocytes from eyes of different colors». Exp. Eye Res.67 (3): 293–9. doi:10.1006/exer.1998.0518. PMID9778410.
Grant MD, Lauderdale DS; Lauderdale (2002). «Cohort effects in a genetically determined trait: eye colour among US whites». Ann. Hum. Biol.29 (6): 657–66. doi:10.1080/03014460210157394. PMID12573082.
German EJ, Hurst MA, Wood D, Gilchrist J; Hurst; Wood; Gilchrist (1998). «A novel system for the objective classification of iris colour and its correlation with response to 1% tropicamide». Ophthalmic Physiol Opt18 (2): 103–10. doi:10.1016/S0275-5408(97)00070-7. PMID9692029.
Prota G, Hu DN, Vincensi MR, McCormick SA, Napolitano A; Hu; Vincensi; McCormick; Napolitano (1998). «Characterization of melanins in human irides and cultured uveal melanocytes from eyes of different colors». Exp. Eye Res.67 (3): 293–9. doi:10.1006/exer.1998.0518. PMID9778410.
Grant MD, Lauderdale DS; Lauderdale (2002). «Cohort effects in a genetically determined trait: eye colour among US whites». Ann. Hum. Biol.29 (6): 657–66. doi:10.1080/03014460210157394. PMID12573082.
German EJ, Hurst MA, Wood D, Gilchrist J; Hurst; Wood; Gilchrist (1998). «A novel system for the objective classification of iris colour and its correlation with response to 1% tropicamide». Ophthalmic Physiol Opt18 (2): 103–10. doi:10.1016/S0275-5408(97)00070-7. PMID9692029.