C. J. Dunst, M. B. Bruder, C. M. Trivette, D. Hamby, M. Raab et al., Characteristics and Consequences of Everyday Natural Learning Opportunities, TECSE, vol.21, issue.2, pp.68-92, 2001.

M. Dávideková, M. Mjartan, and M. Gregus, Utilization of Virtual Reality in Education of Employees in Slovakia, Procedia Computer Science, vol.113, pp.253-260, 2017.

S. Yoganathan, D. A. Finch, E. Parkin, and J. Pollard, 360 Virtual Reality Video for the Acquisition of Knot Tying Skills: A Randomized Controlled Trial, International Journal of Surgery, vol.54, pp.24-27, 2018.

O. Mantziou, N. M. Papachristos, and T. A. Mikropoulos, Learning activities as enactments of learning affordance in MUVEs: A review-based classification, Educational Information Technologies, vol.23, pp.1737-1765, 2018.

F. Y. Chiu, Virtual reality for learning languages based on mobile devices, IEEE 16th International Conference on Information Technology Based Higher Education and Training, pp.10-12, 2017.

T. ;. Davis, M. Capraro, and J. Capraro-&-morgan, Affordances of virtual worlds to support STEM project-based learning, STEM Project-Based Learning: An Integrated Science, Technology, Engineering, and Mathematics (STEM) approach, pp.77-84, 2012.

N. Pellas, I. Kazanidis, N. Konstantinou, and G. Georgio, Exploring the educational potential of three-dimensional multi-user virtual worlds for STEM education: A mixed-method systematic literature review, Educ Inf Technol, vol.22, pp.2235-2279, 2017.

M. Okutsu, D. Delaurentis, S. Brophy, and J. Lambert, Teaching an aerospace engineering design course via virtual worlds: A comparative assessment of learning outcomes, Computers & Education, vol.60, issue.2, pp.288-298, 2013.

K. Krippendorff, Content analysis: An introduction to its methodology, 2004.

G. Papanastasiou, A. Drigas, C. Skianis, M. Lytras, and E. Papanastasiou, Virtual and augmented reality effects on K-12, higher and tertiary education students' twenty-first century skills, Virtual Reality, pp.1-12, 2018.

D. Mcdonough, Similarities and Differences between Adult and Child Learners as Participants in the Natural Learning Process, Psychology, vol.4, issue.3, pp.345-348, 2013.

A. N. Islam, The moderation effect of user-type (educators vs. students) in learning management system continuance, Behaviour & Information Technology, vol.34, issue.12, pp.1160-1170, 2015.

A. K. Islam, The role of perceived system quality as educators' motivation to continue e-learning system use, AIS Transactions on Human-Computer Interaction, vol.4, issue.1, pp.25-43, 2012.