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Pebsworth, Paula A.; Huffman, Michael A.; Lambert, Joanna E.; Young, Sera L. (January 2019). «Geophagy among nonhuman primates: A systematic review of current knowledge and suggestions for future directions» (στα αγγλικά). American Journal of Physical Anthropology168 (S67): 164–194. doi:10.1002/ajpa.23724. PMID30508222.
Krishnamani, R.; Mahaney, William C. (2000-05-01). «Geophagy among primates: adaptive significance and ecological consequences» (στα αγγλικά). Animal Behaviour59 (5): 899–915. doi:10.1006/anbe.1999.1376. PMID10860518.
de Souza, Luciane L.; Ferrari, Stephen F.; da Costa, Marcondes L.; Kern, Dirse C. (2002). «Geophagy as a Correlate of Folivory in Red-Handed Howler Monkeys (Alouatta belzebul) from Eastern Brazilian Amazonia». Journal of Chemical Ecology28 (8): 1613–1621. doi:10.1023/A:1019928529879. ProQuest733005062. PMID12371813.
de Souza, Luciane L.; Ferrari, Stephen F.; da Costa, Marcondes L.; Kern, Dirse C. (2002). «Geophagy as a Correlate of Folivory in Red-Handed Howler Monkeys (Alouatta belzebul) from Eastern Brazilian Amazonia». Journal of Chemical Ecology28 (8): 1613–1621. doi:10.1023/A:1019928529879. ProQuest733005062. PMID12371813.
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