1. The evolution of breeding seasons;Baker,1938
2. The effect of light intensity and day length on reproduction in the English sparrow;Bartholomew;Bull. Museum Comp. Zool. Harvard College,1949
3. The white-crowned sparrows (Zonotrichia leucophrys) of the Pacific seaboard: environment and annual cycle;Blanchard;Univ. Calif. Publ. Zool,1941
4. The reproductive cycles of the British and Continental races of the starling (Sturnus vulgaris L.);Bullough;Phil. Trans. Roy. Soc. London, Ser. B,1942
5. Die endonome Tagesrhythmik als Grunglage der photoperiodischen Reaktion;Bünning;Ber. Deut. Bot. Ges,1936