Jones, E.K.M.; Prescott, N.B. (2000). "Visual cues used in the choice of mate by fowl and their potential importance for the breeder industry". World's Poultry Science Journal. 56 (2): 127–138. doi:10.1079/WPS20000010. S2CID86481908.
Jones, E.K.M.; Prescott, N.B. (2000). "Visual cues used in the choice of mate by fowl and their potential importance for the breeder industry". World's Poultry Science Journal. 56 (2): 127–138. doi:10.1079/WPS20000010. S2CID86481908.