АЛІ, Аль-газу. Definition of Scientific Based Approaches to the Classification of Costs of Air Enterprise. Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas (Series: Economics and Management in the Oil and Gas Industry), [S. l.], v. 1, n. 13, p. 78–83, 2018. Disponível em: https://eung.nung.edu.ua/index.php/ecom/article/view/52. Acesso em: 4 may. 2024.