Nurani Sirajuddin, Sitti, Indriati Sudirman, Lydia Devega Bahar, Abdel Rahman Al Tawaha, and Abdel Razzaq Al-Tawaha. 2018. “Social Economic Factors That Affect Cattle farmer’s Willingness to Pay for Artificial Insemination Programs”. Bulgarian Journal of Agricultural Science 24 (4): 574–580. https://agriacad.eu/ojs/index.php/bjas/article/view/4925.