1. Baysholanova, S. S. 2017. Agroclimatic resources of the Akmola region: A scientific and applied reference book, 133. Astana: Institute of Geography LLP MES RK.
2. Dospekhov, B. A. 1985. Methodology of field experience (with the basics of statistical processing of research results), 351. 5th ed. Moscow: Agropromizdat.
3. Grib, S. I., and M. A. Kadyrov. 1981. Transgressive variability and selection for productivity of spring barley//Abstracts of the conference on the selection and seed production of wheat, rye, barley and triticale, 55–56. Odessa, Ukraine: ASVTN (All-Union State Varietal Testing Network).
4. Konovalov, Y. B. 1981. Formation of spike productivity of spring wheat and barley, 175. Moscow: Kolos Publ.