1. S.
Cotton
, Lanthanide and Actinide Chemistry, John Wiley & Sons, Chichester, West Sussex, 2006
2. J.
Emsley
, Nature's Building Blocks: An A-Z Guide to the Elements, Yttrium, Oxford University Press, Oxford, 2011, pp. 617–620
3. V. R.
Sastri
, J. R.Perumareddi, V.Ramachandra Rao, G. V. S.Rayudu and J.-C.Bünzli, Modern Aspects of Rare Earths and their Complexes, Elsevier, Amsterdam, 2003