Simões, K., A. M. Orsi, B. C. Schimming, and E. J. Benetti. “Seasonal Reproductive Cycle and Variability in Plasma Testosterone Levels in the Domestic Duck (Anas Platyrhynchos)”. Bioscience Journal, vol. 33, no. 1, Feb. 2017, pp. 153-64, doi:10.14393/BJ-v33n1a2017-34113.