Hopfner, Johanna. “VALUE AND MARKET VALUE OF EDUCATION. UNSCHEDULED THOUGHTS ABOUT DIFFICULT TO MEASURE SIZES”. Education in the 21st Century 2, no. 2 (September 4, 2023): 55–70. Accessed May 21, 2024. https://journals.ysu.am/index.php/Educ-21st-Century/article/view/10779.