References Treccani.itTreccani.it: Enciclopedia, Vocabolario
; ; Sapere.itSapere.it. Enciclopedia
; AGROVOCFAO <Food and Agriculture Organization of the United Nations> AGROVOC Multilingual thesaurus
; 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
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