Gurcan, F., O. Ozyurt, and N. E. Cagitay. “Investigation of Emerging Trends in the E-Learning Field Using Latent Dirichlet Allocation”. The International Review of Research in Open and Distributed Learning, Vol. 22, no. 2, Jan. 2021, pp. 1-18, doi:10.19173/irrodl.v22i2.5358.