TROSTINA, Kira. Marketing Non-Degree Supplementary Programs in Tertiary Education Organizations in Russia. European Scientific Journal, ESJ, [S. l.], v. 13, n. 10, 2017. DOI: 10.19044/esj.2017.v13n10p%p. Disponível em: https://test.eujournal.org/index.php/esj/article/view/9462. Acesso em: 5 jun. 2025.