1. Aleksandrov L.N., Naydenova O.A., – “Laboratory and practical classes on soil science”. Leningrad, “Agropromizdat”. – (Leningrad Department, 1986)
2. Targulyan V.O., Gerasimova M.I., World correlative base of soil resources: a basis for international classification and correlation of soils. – (M.: KMK, 2007)
3. Soils of the Armenian SSR/Edited by R.A.Edilyan, G.P.Petrosyan, N.N.Rozov. – (Yerevan: Hayastan, 1976)
4. Fried A.S., Kuznetsova I.V., et.al., Zonal-provincial norms of changes in agrochemical, physico-chemical and physical indicators of the main arable soils of the European territory of Russia under anthropogenic impacts. Method. recommendations. (M.: Soil Institute named after V.V. Dokuchaev, 2010)