1. FAO, 2006. Guidelines for soil description. Fourth edition. FAO. Food and Agriculture Organization of the United Nations, Rome, Italy. 97p. Available at [Access date: 07.01.2007]: http://www.fao.org/3/a-a0541e.pdf
2. FAO, 2015. World reference base for soil resources 2014. International soil classification system for naming soils and creating legends for soil maps. Update 2015. World Soil Resources Reports No. 106. Food and Agriculture Organization of the United Nations, Rome, Italy. 192p. Available at [Access date: 21.11.2019]: http://www.fao.org/3/i3794en/I3794en.pdf
3. Nasirova, A.I., Aliyeva, M.M., Mammadova, R.N., Hasanova, T.A. Bioecological edificators of gray-brown soils in Ganja-Gazakh Massif (Azerbaijan). Environment and Ecology Research, 2022. Vol. 10, No. 3, pp. 392 - 397, USA, http://doi.org/10.13189/eer.2022.100307 https://www.hrpub.org/journals/article_info.php?aid=12233
4. Gee, G.W., Bauder, J.W. Particle-size Analysis. In: Methods of Soil Analysis, Part 2, Chemical and Microbiological Properties, A.L. Page, R.H. Miller, D.R. Keeney (Eds.), 2nd Edition. Agronomy Monograph No. 9, American Society of Agronomy, Soil Science Society of America. Madison, Wisconsin, USA. 1986. pp. 383-411.
5. Rowell, D.L. “Soil Science: Methods & Applications,” 1st Edition. Longman Scientific & Technical; Wiley, Harlow publ. 1994. UK, London. 368 p. https://doi.org/10.4324/9781315844855