ABRAM, M.; SLEBODA, M. Directions the development of business tourism in Poland - issues of sustainability. Ecocycles, [S. l.], v. 2, n. 1, p. 35-43, 2016. DOI: 10.19040/ecocycles.v2i1.52. Disponível em: https://www.ecocycles.eu/ojs/index.php/ecocycles/article/view/52. Acesso em: 14 aug. 2020.