Iron Compounds, Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, 2005, doi:10.1002/14356007.a14_591 Catherine E. Housecroft, A. G. Sharpe:
互联网档案馆的存檔,存档日期2012-10-21. Gudmundsen, Jinny. 13. iPad Apps For Kids For Dummies. John Wiley & Sons. 2012-11-27: 124 [2013-05-14]. ISBN 1118525450. (原始内容存档于2016-03-07)