BHORANIYA, H L, et al. “EARLY PREGNANCY DIAGNOSIS THROUGH TRANSRECTAL ULTRASONOGRAPHY AND PLASMA PROGESTERONE ASSAY IN KANKREJ COWS”. The Indian Journal of Animal Reproduction, vol. 32, no. 2, Dec. 2011, pp. 23-25, https://acspublisher.com/journals/index.php/ijar/article/view/4659.