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   4. Yoon, Carol Kaesuk. "Donald R. Griffin 88, Dies; Argued Animals Can Thin" The New York Times, November 14, 2003. Accessed July 16, 2010 [5]D. R. Griffin (1958). Listening in the dark. Yale Univ. Press, New York.
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2. 1. Santani Tang, “A device for human ultrasonic echolocation,” IEEE Workshop on Multimodal and Alternative Perception for Visually Impaired People, ICME, 2013.
   2. G. Jones, “Echolocation.” Current. Biol., vol. 15, no. 13, pp. R484–R488, Jul. 2005.
   3. 207 (25 Holland, R. A.; Waters, D. A.; Rayners, J. M. V. (2004). "Echolocation signal structure in the Megachiropteran bat Geoffrey 1810". Journal of Experimental Biology
   4. Yoon, Carol Kaesuk. "Donald R. Griffin 88, Dies; Argued Animals Can Thin" The New York Times, November 14, 2003. Accessed July 16, 2010
   5. D. R. Griffin (1958). Listening in the dark. Yale Univ. Press, New York. [6]Dijkgraaf, S (1949). "Spallanzani und die Fledermäuse". Experiential 5 (2): 90–92..