Камінська, І. Б. “Evaluating of the Effectiveness of Cost Management for Employees of Oil and Gas Extraction Enterprises of PJSC ‘Ukrnafta’ Precarpathian Basin”. Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas (Series: Economics and Management in the Oil and Gas Industry), vol. 2, no. 12, Sept. 2015, pp. 29-36, https://eung.nung.edu.ua/index.php/ecom/article/view/112.