Moore, M. C., Schwabl, H., & Farner, D. S. (1983). Biochronometry of testicular
regression in white-crowned sparrows (Zonotrichia leucophrys gambelii). Journal of Comparative Physiology
A-Neuroethology Sensory Neural and Behavioral Physiology, 153(4), 489-494. doi:10.1007/BF00612603.