1. Adina, N., & Medet, Y. (2012). Cultural Tourism Motivation—The Case of Romanian Youths. Economic Science Series, 21(1), 548–553.
2. Ajang, P. E. (2001). Assessing the Role of Work Motivation on Employee Performance. Umeå School of Business and Economics. C-Level Thesis.
3. Akbas, A., & Kan, A. (2007). Affective Factors that Influence Chemistry Achievement (Motivation and Anxiety) and the Power of these Factors to Predict Chemistry Achievement-II. Journal of Turkish Science Education, 4(1), 10–19.
4. Alderfer, C. P. (1969). An empirical test of a new theory of human needs. Organizational behavior and human performance, 4(2), 142–175.
5. Alderfer, C. P. (1977). A Critique of Salancik and Pfeffer’s Examination of Need-Satisfaction Theories. Administrative Science Quarterly, 22, 658–669.