Kovács, Réka Katalin, és mtsai. „Effect of Different Phosphorus Intakes on Phosphorus Balance and Performance of Layers During Peak Production”. Acta Agraria Kaposváriensis, köt. 10, sz. 2, 2006. július, o. 193-8, https://journal.uni-mate.hu/index.php/aak/article/view/1794.