Zimmerman, Kenneth; Heatwole, Harold (1990). "Cutaneous Photoreception: A New Sensory Mechanism for Reptiles". Copeia. 1990 (3): 860–862. doi:10.2307/1446454. JSTOR1446454.
Zimmerman, Kenneth; Heatwole, Harold (1990). "Cutaneous Photoreception: A New Sensory Mechanism for Reptiles". Copeia. 1990 (3): 860–862. doi:10.2307/1446454. JSTOR1446454.