“Study on the Occurrence of External and Gastrointestinal Parasites and Sub-Clinical Mastitis on Crossbred Dairy Cows under Different Feeding and Management Conditions in the Central Highlands of Ethiopia”. 2014. Global Journal of Science Frontier Research 14 (D7): 37-40. https://www.journalofscience.org/index.php/GJSFR/article/view/1394.