Islam, M., K. Kizaki, T. Takahashi, J. Khanom, S. Debnath, and M. Khandoker. “Pregnancy Diagnosis in Black Bengal Goat by Progesterone Assay”. Bangladesh Journal of Animal Science, vol. 43, no. 3, Dec. 2014, pp. 180-4, doi:10.3329/bjas.v43i3.21645.