ZHAO, Tinghui. Valve Corporation’s Evolution from a Game Developer to the Gaming Titan. Transactions on Social Science, Education and Humanities Research, London, U.K., v. 11, p. 502–508, 2024. DOI: 10.62051/jpwjba36. Disponível em: https://wepub.org/index.php/TSSEHR/article/view/2683. Acesso em: 8 jul. 2026.