Clark Arcadi, A; Robert, D; Mugurusi, F (2004). "A comparison of buttress drumming by male chimpanzees from two populations". Primates; Journal of Primatology. 45 (2): 135-9. doi:10.1007/s10329-003-0070-8. PMID14735390.
Kalan, AK; Rainey, HJ. (2009). "Hand-clapping as a communicative gesture by wild female swamp gorillas". Primates. 50 (3): 273-5. doi:10.1007/s10329-009-0130-9. PMID19221858.
Clark Arcadi, A; Robert, D; Mugurusi, F (2004). "A comparison of buttress drumming by male chimpanzees from two populations". Primates; Journal of Primatology. 45 (2): 135-9. doi:10.1007/s10329-003-0070-8. PMID14735390.
Kalan, AK; Rainey, HJ. (2009). "Hand-clapping as a communicative gesture by wild female swamp gorillas". Primates. 50 (3): 273-5. doi:10.1007/s10329-009-0130-9. PMID19221858.