GNUSOWSKI, Marek. The Business Services Industry in the Context Of Professional Services - the Relationship Approach. DEMO, Poland, v. 6, n. 4, p. 63–78, 2018. DOI: 10.18559/SOEP.2018.4.4. Disponível em: https://ojs34.fimagis.pl/index.php/demo/article/view/1097. Acesso em: 18 apr. 2026.