Our understanding of how this blue egg gene works is much farther along now but I still loved finding this in the archives of the archives this morning!
Reginald Punnett (1933). Genetic studies in poultry: IX. The blue egg
Journal of Genetics 27 (3) : 465 - 470
https://web.archive.org/web/20161020042409/www-old.ias.ac.in/jarch/jgenet/27/465.pdf
