Ussabayev Arman, Caroline Aggestam Pontoppidan, и Ussabayev Damir. «ACTUAL PROBLEMS OF ACCOUNTING OF CONCESSION ASSETS AND LIABILITIES IN THE REPUBLIC OF KAZAKHSTAN». Scientific Journal of Pedagogy and Economics, no. 2 (апрель 12, 2019): 28–36. просмотрено декабрь 5, 2025. https://journals.nauka-nanrk.kz/bulletin-science/article/view/1704.