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McNeill 2004, p. 31 McNeill, John (2004). "Nomenclature of cultivated plants: a historical botanical standpoint in: C.G. Davidson and P. Trehane (eds), Proc. XXVI IHC – IVth International Symposium on the Taxonomy of Cultivated Plants". Acta Horticulturae. 634 (634): 29–36. doi:10.17660/ActaHortic.2004.634.2.
McNeill 2004, pp. 25–36 McNeill, John (2004). "Nomenclature of cultivated plants: a historical botanical standpoint in: C.G. Davidson and P. Trehane (eds), Proc. XXVI IHC – IVth International Symposium on the Taxonomy of Cultivated Plants". Acta Horticulturae. 634 (634): 29–36. doi:10.17660/ActaHortic.2004.634.2.
Trehane 2004, pp. 17–27 Trehane, Piers (2004). "50 years of the International Code of Nomenclature for Cultivated Plants: Future prospects for the Code". Acta Horticulturae. 634 (634): 17–27. doi:10.17660/ActaHortic.2004.634.1.
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Jirásek 1961 Jirásek, Václav (1961). "Evolution of the Proposals of Taxonomical Categories for the Classification of Cultivated Plants". Taxon. 10 (2): 34–45. doi:10.2307/1217450. JSTOR1217450.