Khayrullina, Y. R., M. Y. Eflova, R. R. Garipova, and E. R. Yamilov. “The Problems of Development of Small Business: The Experience of Empirical Research (based on the Materials of the Republic of Tatarstan)”. Amazonia Investiga, vol. 7, no. 17, Dec. 2018, pp. 406-13, https://amazoniainvestiga.info/index.php/amazonia/article/view/755.