*[http://database.prota.org/dbtw-wpd/exec/dbtwpub.dll?AC=QBE_QUERY&BU=http%3A%2F%2Fdatabase.prota.org%2Fsearch.htm&TN=PROTAB~1&QB0=AND&QF0=Species+Code&QI0=Amaranthus+spinosus&RF=Webdisplay PROTAbase on ''Amaranthus spinosus''] {{en icon}}

*[http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?290,294,307 Jepson Manual Treatment] {{en icon}}