Wallach, Hans (1948). "Brightness Constancy and the Nature of Achromatic Colors". Journal of Experimental Psychology. 38 (3): 310–324. doi:10.1037/h0053804. PMID18865234.
Shapley, Robert (1984). "Visual Adaptation and Retinal Gain Controls". Progress in Retinal Research. 3: 263–346. doi:10.1016/0278-4327(84)90011-7.Parameter |coauthors= yang tidak diketahui mengabaikan (|author= yang disarankan) (bantuan)
Wallach, Hans (1948). "Brightness Constancy and the Nature of Achromatic Colors". Journal of Experimental Psychology. 38 (3): 310–324. doi:10.1037/h0053804. PMID18865234.