Heenan, P.B. 1992: The origin of Sophora 'Gnome' and the growth habit of Sophora 'Earlygold'. Horticulture in New Zealand, Journal of the Royal New Zealand Institute of Horticulture 3(1): 2–6.
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| Heenan, P.B. 1992: The origin of Sophora 'Gnome' and the growth habit of Sophora 'Earlygold'. Horticulture in New Zealand, Journal of the Royal New Zealand Institute of Horticulture 3(1): 2–6. |