Valentim, R. (2002) “Testicular biometry of Nellore (Bos taurus indicus) and crossbred bulls (Bos taurus indicus x Bos taurus taurus) at 20 and 24 months of age”, Brazilian Journal of Veterinary Research and Animal Science, 39(3), pp. 113–120. doi:10.1590/S1413-95962002000300001.