↑Brian W. Clare, David L. Kepert: Coordination Numbers & Geometries. W: Encyclopedia of Inorganic Chemistry. R. Bruce King (red. nacz.). Wyd. 2. T. I. Chichester: Wiley, 2005, s. 10. ISBN 978-0-470-86078-6.
↑Coordination and Organometallic Compounds, [w:] Norman N.N.N.GreenwoodNorman N.N.N., AlanA.EarnshawAlanA., Chemistry of the Elements, wyd. 2, Oxford–Boston: Butterworth-Heinemann, 1997, s. 917, ISBN 0-7506-3365-4(ang.).