Pinkovetskaia, I. S., Y. V. Nuretdinova, y A. A. Navasardyan. «Entrepreneurship in the Third Age: Data from Russia». Amazonia Investiga 9, no. 27 (marzo 21, 2020): 165–172. Accedido enero 25, 2026. https://amazoniainvestiga.info/index.php/amazonia/article/view/1215.