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	1.	Hand use and gestural communication in chimpanzees (Pan troglodytes). [electronic resource] by Hopkins, W D Leavens, D A Producer: 19980428 In: Journal of comparative psychology (Washington, D.C. : 1983) vol. 112 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Intentional communication by chimpanzees: a cross-sectional study of the use of referential gestures. [electronic resource] by Leavens, D A Hopkins, W D Producer: 19990126 In: Developmental psychology vol. 34 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	3.	The whole-hand point: the structure and function of pointing from a comparative perspective. [electronic resource] by Leavens, D A Hopkins, W D Producer: 20000127 In: Journal of comparative psychology (Washington, D.C. : 1983) vol. 113 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	4.	Indexical and referential pointing in chimpanzees (Pan troglodytes). [electronic resource] by Leavens, D A Hopkins, W D Bard, K A Producer: 19970204 In: Journal of comparative psychology (Washington, D.C. : 1983) vol. 110 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	5.	Effects of cognitive challenge on self-directed behaviors by chimpanzees (Pan troglodytes). [electronic resource] by Leavens, D A Aureli, F Hopkins, W D Hyatt, C W Producer: 20010927 In: American journal of primatology vol. 55 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)