Brothwell, Don (1979). Roman evidence of a crested form of domestic fowl, as indicated by a skull showing associated cerebral hernia. Journal of Archaeological Science 6 (3, September 1979): 291–293. (subscription required).
Wang, Yanqiang; Gao, Yu; Imsland, Freyja; Gu, Xiaorong; Feng, Chungang; Liu, Ranran; Song, Chi; Tixier-Boichard, Michèle; Gourichon, David; Li, Qingyuan; Chen, Kuanwei; Li, Huifang; Andersson, Leif; Hu, Xiaoxiang; Li, Ning (2012). "The Crest Phenotype in Chicken Is Associated with Ectopic Expression of HOXC8 in Cranial Skin". PLoS ONE. 7 (4): e34012. doi:10.1371/journal.pone.0034012. PMC 3326004. PMID 22514613.
Frahm, Heiko D.; Rehkämper, Gerd (1998). "Allometric Comparison of the Brain and Brain Structures in the White Crested Polish Chicken with Uncrested Domestic Chicken Breeds". Brain, Behavior and Evolution. 52 (6): 292–307. doi:10.1159/000006574. PMID 9807014.
