LOUDON, John Claudius. An Encyclopædia of Gardening: Comprising the Theory and Practice of Horticulture, Floriculture, Arboriculture, and Landscape Gardening; Including All the Latest Improvements; a General History of Gardening in All Countries; and a Statistical View of Its Present State; with Suggestions for Its Future Progress in the British Isles [online]. 1835. Dostupné online.
CLUTTON-BROCK, A. Studies in gardening. New York: C. Scribner's Sons, 1916. Dostupné online. S. 16-19. (anglicky)