Al-Ramahi, Nidal. “The Level of Application of Cost System Based on Activities in Jordanian Airlines”. Al-Balqa Journal for Research and Studies 21, no. 1 (June 30, 2018): 37–51. Accessed October 10, 2026. https://ajrs.ammanu.edu.jo/ojs/index.php/albalqajournal/article/view/197.