↑ Holleman, A. F. and Wiberg, E. (2001) Inorganic Chemistry, San Diego, CA: Academic Press, ISBN0-12-352651-5
↑ Robert Kresse, Ulrich Baudis, Paul Jäger, H. Hermann Riechers, Heinz Wagner, Jochen Winkler, Hans Uwe Wolf, "Barium and Barium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2007 Wiley-VCH, Weinheim. doi:10.1002/14356007.a03_325.pub2