• Author: Gwinner, E. F. W. Turek S.D. Smith
• Title: Extraocular light perception in photoperiodic responses of the white-crowned sparrow (Zonotrichia leucophrys) and of the golden-crowned sparrow (Z. atricapilla)
• Year: 1971
• Reference Type: Journal Article
• Journal/Book Title: Z. vergl. Physiologie
• Volume: 75
• Pages: 323-331
• Date of Publication: Monday, 20 December 1971