Gráff, Myrtill, Ákos Benk, és Sándor Kukovics. 2013. „Relationship Between the Number of Lactation and Milk Yield on Saanen Goat Farms”. Review on Agriculture and Rural Development 2 (1):74-78. https://ojs.bibl.u-szeged.hu/index.php/rard/article/view/13285.