APA (7th ed.) Citation

Boelens, R., De Wever, B., & Voet, M. (2017). Four key challenges to the design of blended learning: A systematic literature review. Educational research review, 22, 1-18. https://doi.org/10.1016/j.edurev.2017.06.001

Chicago Style (17th ed.) Citation

Boelens, Ruth, Bram De Wever, and Michiel Voet. "Four Key Challenges to the Design of Blended Learning: A systematic Literature Review." Educational Research Review 22 (2017): 1-18. https://doi.org/10.1016/j.edurev.2017.06.001.

MLA (9th ed.) Citation

Boelens, Ruth, et al. "Four Key Challenges to the Design of Blended Learning: A systematic Literature Review." Educational Research Review, vol. 22, 2017, pp. 1-18, https://doi.org/10.1016/j.edurev.2017.06.001.