GRACZYK, A. Taking Into Account the Effects in Field of Improvement of Quality Environment in Opinion of Efficiency of Undertakings. Regional Barometer. Analyses & Prognoses, [S. l.], n. 4 (26), p. 39–44, 2012. DOI: 10.56583/br.1303. Disponível em: https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/1303. Acesso em: 3 jul. 2024.