Spann, S., and J. Levings. “Eggcellent Adventures in Classroom Embryology: An Intracurricular Guide to Chicken Embryology: 4H368/4H368, 11/2015”. EDIS, vol. 2015, no. 8, Nov. 2015, p. 88, doi:10.32473/edis-4h368-2015.