Sah, A., R. Bastola, Y. Pandeya, L. Pathak, M. Acharya, and D. Khanal. “Accuracy of Pregnancy Diagnosis With Commercially Available Progesterone Kit in Dairy Cows”. Nepalese Veterinary Journal, vol. 34, Dec. 2017, pp. 101-6, doi:10.3126/nvj.v34i0.22908.