1. Afanas’ev, A.N., 1927. Classification problem. In: Pedology, in: Akad, I. (Ed.), Advances in Soil Science Reposts of Soviet Delegates to the 1st International Soil Science Congress in Washington. Nauk, SSSR, pp. 49–108.
2. Alhammadi, M.S., Al-Shrouf, A.M., 2013. Irrigation of Sandy Soils, Basics and Scheduling Chapter. In: Goyal, A., Asif, M. (Eds.), Crop Production. IntechOpen, London, UK. https://doi.org/10.5772/55117.
3. The stratigraphy of the 3.5-3.2 Ga Barberton Greenstone Belt revisited: a single zircon ion microprobe study;Armstrong;Earth Planet. Sci. Lett.,1990
4. Purposes of soil classification;Bakker;Geoderma,1970
5. Beletskii, N., 1985. Soil Science. Origin of soils and their composition and properties. Kinds of soils, their classification, assessment, an mapping. Moscow.