(Ingelesez)Spencer P. S.; Ludolph A. C.; Kisby G. E.. (1993ko uztaila). «Neurologic diseases associated with use of plant components with toxic potential» Environmental Research 62 (1): 106–113. doi:10.1006/enrs.1993.1095. PMID8325256..
(Ingelesez)Spencer P. S.; Ludolph A. C.; Kisby G. E.. (1993ko uztaila). «Neurologic diseases associated with use of plant components with toxic potential» Environmental Research 62 (1): 106–113. doi:10.1006/enrs.1993.1095. PMID8325256..