Rainer W. Scora, 1975. On the history and origin of citrus. Bulletin of the Torrey Botanical Club 102(6):369–375 [3]
springerlink.com
Frederick Gmitter and Xulan Hu, 1990. The possible role of Yunnan, China, in the origin of contemporary Citrus species (Rutaceae). Economic Botany 44(2):267–277 [1][nefuncțională]
unctad.org
United Nations Conference on Trade and Development. M@rket Inform@tion in the Commodities Area: Citrus fruits [2]
