VAPNYARSKAYA, Olga Igorevna, y Tatyana Mikhailovna KRIVOSHEEVA. 2020. «Improving the Quality of Tourist Services in Central Russia». Utopía Y Praxis Latinoamericana 25 (5), 317-27. https://www.produccioncientificaluz.org/index.php/utopia/article/view/33490.