(原始内容存档于2016-05-17). Essig, Edward Oliver. Fort Ross: California Outpost of Russian Alaska, 1812-1841 (Kingston, Ont.: Limestone Press, 1991.) Gibson, James R
Fernández-Murga, Maria L.; Goetz, Michael; Clement, Jason; Cassera, Maria B.; Kingston, David G. I. Antiplasmodial alkaloids from bulbs of Amaryllis belladonna