Schwabl, Hubert Verhaltensphysiologie, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society;
Schwabl, H., & Farner, D. S. (1989). Dependency of testosterone of photoperiodically-induced vernal fat disposition in female white-crowned sparrows. The Condor, 91(1), 108-112. doi:10.2307/1368153.