$a Kp. Trees and shrubs hardy in the British Isles / W. J. Bean. Vol 1. - 8th ed. rev. - London, dr. 1996. $b Red.
670
$a Index kewensis [...]. Supplementum duodecimum [...] / ductu et consilio Georgii Taylor ; confecerunt Herbarii Horti Regii Botanici Kewensis curatores. - Oxonii, 1959.