Kul, Selim, and Ibrahim Seker. “Phenotypic Correlations Between Some External and Internal Egg Quality Traits in the Japanese Quail (Coturnix Coturnix Japonica)”. International Journal of Poultry Science, vol. 3, no. 6, May 2004, pp. 400–405, https://doi.org/10.3923/ijps.2004.400.405.