References Treccani.itTreccani.it: Enciclopedia, Vocabolario
; CABCommonwealth agricultural bureaux International, CAB Thesaurus
; NALTUSDA <United States department of agriculture> - National agricultural library - Inter-American institute for cooperation on agriculture, National Agricultural Library Thesaurus Concept Space
; ; Wikipedia(IT)Wikipedia. L'enciclopedia libera, 2001 [ed. in lingua italiana dell' enciclopedia online Wikipedia]
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