Terčič, Dušan, and Mojca Pestotnik. “Effect of Excess Folic Acid on Egg Production, Fertility and Hatchability in Layer Breeders”. Acta Agraria Kaposváriensis, vol. 18, no. 1, Feb. 2014, pp. 122-8, https://journal.uni-mate.hu/index.php/aak/article/view/2115.