Roberts, Mark L. Vogelwarte Radolfzell, Radolfzell, Max Planck Institut für Ornithologie, Max Planck Society;
Roberts, M. L., Buchanan, K. L., Hasselquist, D., & Evans, M. R. (2007). Effects of testosterone and corticosterone on immunocompetence in the zebra finch. Hormones and Behavior, 51(1), 126-134. doi:10.1016/j.yhbeh.2006.09.004.