Darwin, Charles (1859). The Origin of Species. pp. Chapter VIII. Instinct: Objections to the theory of natural selection as applied to instincts: neuter and sterile insects. Archived from the original on 2016-08-16. Retrieved 2013-03-08.
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Betzig, L.; Turke, P. (1986). "Food sharing on Ifaluk". Current Anthropology. 27 (4): 397–400. doi:10.1086/203457. S2CID144688339.
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Ziker, J.; Schnegg, M. (2005). "Food sharing at meals: Kinship, reciprocity, and clustering in the Taimyr Autonomous Okrug, northern Russia". Human Nature. 16 (2): 178–210. doi:10.1007/s12110-005-1003-6. PMID26189622. S2CID40299498.
Grayson, D. K. (1993). "Differential mortality and the Donner Party disaster". Evolutionary Anthropology. 2 (5): 151–9. doi:10.1002/evan.1360020502. S2CID84880972.
Davis, J. N.; Daly, M. (1997). "Evolutionary theory and the human family". Quarterly Review of Biology. 72 (4): 407–35. doi:10.1086/419953. PMID9407672. S2CID25615336.
Ziker, J.; Schnegg, M. (2005). "Food sharing at meals: Kinship, reciprocity, and clustering in the Taimyr Autonomous Okrug, northern Russia". Human Nature. 16 (2): 178–210. doi:10.1007/s12110-005-1003-6. PMID26189622. S2CID40299498.
Lucas, J. R.; Creel, S. R.; Waser, P. M. (1996). "How to Measure Inclusive Fitness, Revisited". Animal Behaviour. 51 (1): 225–228. doi:10.1006/anbe.1996.0019. S2CID53186512.
Barber, N. (1994). "Machiavellianism and altruism: Effects of relatedness of target person on Machiavellian and helping attitudes". Psychological Reports. 75: 403–22. doi:10.2466/pr0.1994.75.1.403. S2CID144789875.
Betzig, L.; Turke, P. (1986). "Food sharing on Ifaluk". Current Anthropology. 27 (4): 397–400. doi:10.1086/203457. S2CID144688339.
Davis, J. N.; Daly, M. (1997). "Evolutionary theory and the human family". Quarterly Review of Biology. 72 (4): 407–35. doi:10.1086/419953. PMID9407672. S2CID25615336.
Ziker, J.; Schnegg, M. (2005). "Food sharing at meals: Kinship, reciprocity, and clustering in the Taimyr Autonomous Okrug, northern Russia". Human Nature. 16 (2): 178–210. doi:10.1007/s12110-005-1003-6. PMID26189622. S2CID40299498.
Grayson, D. K. (1993). "Differential mortality and the Donner Party disaster". Evolutionary Anthropology. 2 (5): 151–9. doi:10.1002/evan.1360020502. S2CID84880972.
Darwin, Charles (1859). The Origin of Species. pp. Chapter VIII. Instinct: Objections to the theory of natural selection as applied to instincts: neuter and sterile insects. Archived from the original on 2016-08-16. Retrieved 2013-03-08.