1. Akpınar, M. (2019). Pedagogic formation students’ investigation of the Relationship between online learning obstacles and Transactional distance perception. Sakarya University: Master's thesis
2. Aksu, G., & Güzeller, C. O. (2016). Classification of PISA 2012 mathematical literacy scores using decision-tree method: Turkey sampling. Education and Science, 41(185), 101–122.
3. Anıl, D. (2009). Factors effecting science achievement of science students in program for international students’ achievement (PISA) in Turkey. Education and Science, 34(152), 87–100.
4. Argyle, M., & Dean, J. (1965). Eye contact, distance and affiliation. Sociometry, 28, 289–304.
5. Arkorful, V., & Abaidoo, N. (2015). The role of e-learning, advantages and disadvantages of its adoption in higher education. International Journal of Instructional Technology and Distance Learning, 12(1), 29–42.