ニルス・ガブリエル・セフストレーム
Sjoberg, Sven Gosta (1951). “Nils Gabriel Sefstrom and the Discovery of Vanadium”. Journal of Chemical Education 28 (6): 294–296. Bibcode: 1951JChEd..28..294S. doi:10.1021/ed028p294. http://search.jce.divched.org/JCEIndex/FMPro?-db=jceindex.fp5&-lay=wwwform&combo=vanadium&-find=&-format=detail.html&-skip=12&-max=1&-token.2=12&-token.3=10. - subscription required
Weeks, Mary Elvira (1932).