SONG, Jiayan. A Brief Analysis of PROYA’s Marketing Strategy Based on 4P Theory. Financial Economics Research, [S. l.], v. 3, n. 3, p. 47–52, 2026. DOI: 10.70267/fer.250303.4752. Disponível em: https://journals.zeuspress.org/index.php/FER/article/view/1048. Acesso em: 30 jul. 2026.