PERRY, James F. Three Levels of Marketing: Random, Routine, and Reflective. Ekonomika, [S. l.], v. 59, p. 161–174, 2002. DOI: 10.15388/Ekon.2002.17014. Disponível em: https://www.zurnalai.vu.lt/ekonomika/article/view/17014. Acesso em: 8 jul. 2025.