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Walsh, P. D.; Abernethy, K. A.; Bermejo, M.; Beyers, R.; De Wachter, P.; Akou, M. E.; Huijbregts, B.; Mambounga, D. I.; Toham, A. K.; Kilbourn, A. M.;, Lahm, S.A.;, Latour. S.; Maisels, F.; Mbinak, C.; Mihindouk, Y.; Obiang, S. N.; Effa, E. N.; Starkey, M. P.; Telfer, P. M.; Thibault, M.; Tutin, C. E. G.; White, L. J. T.; Wilkie, D. S. Catastrophic ape decline in western equatorial Africa(PDF). Nature. 2003, 422 (6932): 611–614 [2023-05-03]. Bibcode:2003Natur.422..611W. PMID 12679788. S2CID 5905831. doi:10.1038/nature01566. (原始内容存档(PDF)于2013-11-10). (页面存档备份,存于互联网档案馆)
Walsh, P. D.; Abernethy, K. A.; Bermejo, M.; Beyers, R.; De Wachter, P.; Akou, M. E.; Huijbregts, B.; Mambounga, D. I.; Toham, A. K.; Kilbourn, A. M.;, Lahm, S.A.;, Latour. S.; Maisels, F.; Mbinak, C.; Mihindouk, Y.; Obiang, S. N.; Effa, E. N.; Starkey, M. P.; Telfer, P. M.; Thibault, M.; Tutin, C. E. G.; White, L. J. T.; Wilkie, D. S. Catastrophic ape decline in western equatorial Africa(PDF). Nature. 2003, 422 (6932): 611–614 [2023-05-03]. Bibcode:2003Natur.422..611W. PMID 12679788. S2CID 5905831. doi:10.1038/nature01566. (原始内容存档(PDF)于2013-11-10). (页面存档备份,存于互联网档案馆)
Walsh, P. D.; Abernethy, K. A.; Bermejo, M.; Beyers, R.; De Wachter, P.; Akou, M. E.; Huijbregts, B.; Mambounga, D. I.; Toham, A. K.; Kilbourn, A. M.;, Lahm, S.A.;, Latour. S.; Maisels, F.; Mbinak, C.; Mihindouk, Y.; Obiang, S. N.; Effa, E. N.; Starkey, M. P.; Telfer, P. M.; Thibault, M.; Tutin, C. E. G.; White, L. J. T.; Wilkie, D. S. Catastrophic ape decline in western equatorial Africa(PDF). Nature. 2003, 422 (6932): 611–614 [2023-05-03]. Bibcode:2003Natur.422..611W. PMID 12679788. S2CID 5905831. doi:10.1038/nature01566. (原始内容存档(PDF)于2013-11-10). (页面存档备份,存于互联网档案馆)
Walsh, P. D.; Abernethy, K. A.; Bermejo, M.; Beyers, R.; De Wachter, P.; Akou, M. E.; Huijbregts, B.; Mambounga, D. I.; Toham, A. K.; Kilbourn, A. M.;, Lahm, S.A.;, Latour. S.; Maisels, F.; Mbinak, C.; Mihindouk, Y.; Obiang, S. N.; Effa, E. N.; Starkey, M. P.; Telfer, P. M.; Thibault, M.; Tutin, C. E. G.; White, L. J. T.; Wilkie, D. S. Catastrophic ape decline in western equatorial Africa(PDF). Nature. 2003, 422 (6932): 611–614 [2023-05-03]. Bibcode:2003Natur.422..611W. PMID 12679788. S2CID 5905831. doi:10.1038/nature01566. (原始内容存档(PDF)于2013-11-10). (页面存档备份,存于互联网档案馆)
《穆斯林聖訓實錄》, 21:4752, "Ibn 'Abbas reported that Allah's Messenger (may peace be upon him) prohibited the eating of all fanged beasts of prey, and all the birds having talons."
Jasra, Abdel Wahid; Isani, G. B.; Camel Applied Research and Development Network. Socio-economics of camel herders in Pakistan. The Camel Applied Research and Development Network. 2000: 164. (原始内容存档于2016-06-10).
U.S. Bureau of Manufactures; U.S. Bureau of Foreign Commerce (1854-1903); Bureau Of Statistics, U.S. Department of Commerce and Labor. Monthly Consular and Trade Reports64 (240–243). U.S. Government Printing Office. 1900 [29 September 2009]. (原始内容存档于2023-01-18). (页面存档备份,存于互联网档案馆)
Walsh, P. D.; Abernethy, K. A.; Bermejo, M.; Beyers, R.; De Wachter, P.; Akou, M. E.; Huijbregts, B.; Mambounga, D. I.; Toham, A. K.; Kilbourn, A. M.;, Lahm, S.A.;, Latour. S.; Maisels, F.; Mbinak, C.; Mihindouk, Y.; Obiang, S. N.; Effa, E. N.; Starkey, M. P.; Telfer, P. M.; Thibault, M.; Tutin, C. E. G.; White, L. J. T.; Wilkie, D. S. Catastrophic ape decline in western equatorial Africa(PDF). Nature. 2003, 422 (6932): 611–614 [2023-05-03]. Bibcode:2003Natur.422..611W. PMID 12679788. S2CID 5905831. doi:10.1038/nature01566. (原始内容存档(PDF)于2013-11-10). (页面存档备份,存于互联网档案馆)