1. L. S.Keith , O. M.Faroon , N.Maples-Reynolds and B. E.Fowler , Germanium , Handbook on the Toxicology of Metals , ed. Gunnar Nordberg , B. Fowler and M. Nordberg , Elsevier , 4th edn, 2014 , pp. 799–816
2. M.Banasik , Germanium , in Hamilton and Hardy's Industrial Toxicology , ed. Raymond D. Harbison , M. M. Bourgeois and G. T. Johnson , Wiley , 6th edn, 2015 , pp. 119–122
3. Y.Katsuhiko , Germanium, Toxicity , in Encyclopedia of Metalloproteins , ed. R. H. Kretsinger , V. N. Uversky and E. A. Permyakov , Springer , 2013 . pp. 842–846
4. Two antoxidant elements of Allium vegetables: germanium and selenium
5. J.Emsley , Nature's Building Blocks: An A-Z Guide to the Elements , Oxford University Press , New York , 2011 , pp. 197–201