*[http://www.ipni.org/ipni/simplePlantNameSearch.do?find_wholeName=Sambucus%20nigra&output_format=normal&query_type=by_query&back_page=query_ipni.html IPNI]
*[http://mansfeld.ipk-gatersleben.de/pls/htmldb_pgrc/f?p=185:45:1329164412874601::NO::P7_BOTNAME,P7_DB_CHECKBOX1,P7_DB_CHECKBOX2,P7_DB_CHECKBOX4:Sambucus%20nigra,,, Mansfeld]
*[http://herbnaeb.umdbrit.umich.eduorg/herbuses/search.pl/?searchstringstring=Sambucus%20nigra Moerman, Native American Ethnobotany]
*[http://www.hort.purdue.edu/newcrop/nexus/Sambucus_canadensis_nex.html NewCrop Purdue] (subsp. ''canadensis'').
*[http://www.theplantlist.org/tpl/search?q=Sambucus%20nigra Plant List]