Булхаирова, Ж., Балкибаева A., and З. Айдынов. “Efficiency of Human Capital Use in Agriculture at the Present Stage of Development”. Journal of Economic Research &Amp; Business Administration, vol. 124, no. 2, June 2018, pp. 154-6, https://be.kaznu.kz/index.php/math/article/view/1982.