References   Sapere.itSapere.it. Enciclopedia
: Avicoltura; 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
; WebDewey(IT)Dewey, Melvil, WebDewey italiana, [basata sulla vers. originale in inglese], Roma, Associazione italiana biblioteche, 2014-.
; Wikipedia(IT)Wikipedia. L'enciclopedia libera, 2001 [ed. in lingua italiana dell' enciclopedia online Wikipedia]

DDC (WebDewey) Dewey, Melvil, WebDewey italiana [basata sulla vers. originale in inglese], Roma, Associazione italiana biblioteche, 2014- 636.68