1. V. I. Vernadsky, Geochemistry Assays (Gorgeolnefteizdat, Moscow, 1934) [in Russian).
2. W. I. Vernadski, C.R. Acad. Sci. Paris 175, 450–452 (1922).
3. V. I. Vernadsky, Selected Papers (AN SSSR, Moscow, 1960), vol. 5, pp. 118–119 [in Russian].
4. B. K. G. Teng, in Encyclopedia of Soil Science (Springer, Heidelberg, 2008), pp. 144–150.
5. E. S. Vil’mova, Paleontological Identification Guide (for Collection of Invertebrate Fossils) (SVGU, Magadan, 2010) [in Russian].