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.journals.vu.lt/ekonomika/article/view/17014.. Acesso em: 6 may. 2024.