Hopkins, W. D., Russell, J. L., Hook, M., Braccini, S., & Schapiro, S. J. (2005). Simple Reaching Is Not So Simple: Association Between Hand Use and Grip Preferences in Captive Chimpanzees.

Hopkins, William D., Jamie L. Russell, Michelle Hook, Stephanie Braccini, and Steven J. Schapiro. Simple Reaching Is Not So Simple: Association Between Hand Use and Grip Preferences in Captive Chimpanzees. 2005.

Hopkins, William D., et al. Simple Reaching Is Not So Simple: Association Between Hand Use and Grip Preferences in Captive Chimpanzees. 2005.