Ronald S.R.S.FishmanRonald S.R.S., Evolution and the Eye: The Darwin Bicentennial and the Sesquicentennial of the Origin of Species, „Archives of Ophthalmology”, 126 (11), 2008, s. 1586, DOI: 10.1001/archopht.126.11.1586, PMID: 19001229 [dostęp 2022-07-14](ang.).
LibingL.ShenLibingL. i inni, The Evolutionary Relationship between Microbial Rhodopsins and Metazoan Rhodopsins, „The Scientific World Journal”, 2013, 2013, s. 1–10, DOI: 10.1155/2013/435651, PMID: 23476135, PMCID: PMC3583139 [dostęp 2022-07-14](ang.).
Jennifer M.J.M.EnrightJennifer M.J.M. i inni, Cyp27c1 Red-Shifts the Spectral Sensitivity of Photoreceptors by Converting Vitamin A1 into A2, „Current Biology”, 25 (23), 2015, s. 3048–3057, DOI: 10.1016/j.cub.2015.10.018, PMID: 26549260, PMCID: PMC4910640 [dostęp 2022-07-14](ang.).
Ronald S.R.S.FishmanRonald S.R.S., Evolution and the Eye: The Darwin Bicentennial and the Sesquicentennial of the Origin of Species, „Archives of Ophthalmology”, 126 (11), 2008, s. 1586, DOI: 10.1001/archopht.126.11.1586, PMID: 19001229 [dostęp 2022-07-14](ang.).
LibingL.ShenLibingL. i inni, The Evolutionary Relationship between Microbial Rhodopsins and Metazoan Rhodopsins, „The Scientific World Journal”, 2013, 2013, s. 1–10, DOI: 10.1155/2013/435651, PMID: 23476135, PMCID: PMC3583139 [dostęp 2022-07-14](ang.).
Jennifer M.J.M.EnrightJennifer M.J.M. i inni, Cyp27c1 Red-Shifts the Spectral Sensitivity of Photoreceptors by Converting Vitamin A1 into A2, „Current Biology”, 25 (23), 2015, s. 3048–3057, DOI: 10.1016/j.cub.2015.10.018, PMID: 26549260, PMCID: PMC4910640 [dostęp 2022-07-14](ang.).