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Limongelli L, Boysen ST, & Visalberghi E. (1995). Comprehension of cause-effect relations in a tool-using task by chimpanzees (Pan troglodytes). J. Comp. Psychol., 109, 18.
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Kummer H, Anzenberger G, & Hemelrijk CK. (1996). Hiding and perspective taking in long-tailed macaques (Macaca fascicularis). J. Comp. Psychol., 110, 97.
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Inoue-Nakamura N, & Matsuzawa T. (1997). Development of stone tool use by wild chimpanzees (Pan troglodytes). J. Comp. Psychol., 111, 159.
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