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lexico.com
"Beaver". Lexico. คลังข้อมูลเก่าเก็บจากแหล่งเดิมเมื่อ 2021-01-30. สืบค้นเมื่อ January 22, 2021.
"Castor". Lexico. คลังข้อมูลเก่าเก็บจากแหล่งเดิมเมื่อ 2021-02-08. สืบค้นเมื่อ January 22, 2021.
R. C. A. Thompson (November 2000). "Giardiasis as a re-emerging infectious disease and its zoonotic potential". International Journal of Parasitology. 30 (12–13): 1259–1267. doi:10.1016/S0020-7519(00)00127-2. PMID11113253.
Lev E (March 2003). "Traditional healing with animals (zootherapy) : medieval to present-day Levantine practice". J Ethnopharmacol. 85 (1): 107–18. doi:10.1016/S0378-8741(02)00377-X. PMID12576209.