References Treccani.itTreccani.it: Enciclopedia, Vocabolario
; AGROVOCFAO <Food and Agriculture Organization of the United Nations> AGROVOC Multilingual thesaurus
; CABCommonwealth agricultural bureaux International, CAB Thesaurus
; ; EncBThe New encyclopaedia Britannica, 15. ed., Chicago [etc.], Encyclopaedia Britannica, 1986. 32 v. + Supplement (1994).
; ITISITIS Integrated Taxonomicon Information System [partners:] USDA, NOA, USGS, Smithsonian Institution... [et al.], 2016-.
; ; NALTUSDA <United States department of agriculture> - National agricultural library - Inter-American institute for cooperation on agriculture, National Agricultural Library Thesaurus Concept Space
; ; TaxThe Taxonomicon & Sistema Naturae 2000, editor S.J. Brands
; Wikipedia(IT)Wikipedia. L'enciclopedia libera, 2001 [ed. in lingua italiana dell' enciclopedia online Wikipedia]
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