Alsalh, Mohammad Almohammad, et al. “Comparative Characteristics of the Genetic Structure of the Syrian Cattle Breed Compared to Holstein and Aberdeen-Angus Breeds”. Journal of Advanced Veterinary and Animal Research, vol. 8, no. 2, June 2021, pp. 339-45, https://banglajol.info/index.php/JAVAR/article/view/76320.