Hamilton, C.W.; Reichard, S.H. Current practice in the use of subspecies, variety, and forma in the classification of wild plants (англ.) // Taxon : journal. — Wiley, 1992. — Vol. 41, no. 3. — P. 485—498. — doi:10.2307/1222819. — JSTOR1222819.
Hamilton, C.W.; Reichard, S.H. Current practice in the use of subspecies, variety, and forma in the classification of wild plants (англ.) // Taxon : journal. — Wiley, 1992. — Vol. 41, no. 3. — P. 485—498. — doi:10.2307/1222819. — JSTOR1222819.