Pulikanti, R., E.D. Peebles, A.O. Sokale, and W.R. Maslin. 2012. “Histological Changes in the Broiler Embryonic Pipping Muscle Between Days 15 and 19 of Incubation”. International Journal of Poultry Science 11 (7): 427–432. https://doi.org/10.3923/ijps.2012.427.432.