Bozkurt, A., Akgun-Ozbek, E., Onrat-Yilmazer, S., Erdogdu, E., Ucar, H., Guler, E., Sezgin, S., Karadeniz, A., Sen, N., Goksel-Canbek, N., Dincer, G. D., Ari, S.,& Aydin, C. H. Trends in Distance Education Research: A Content Analysis of Journals 2009-2013. International Review of Research in Open and Distributed Learning. 2015, 16 (1): 330–363 [2017-05-10]. (原始内容存档于2019-03-27).
Bozkurt, A., Akgun-Ozbek, E., Onrat-Yilmazer, S., Erdogdu, E., Ucar, H., Guler, E., Sezgin, S., Karadeniz, A., Sen, N., Goksel-Canbek, N., Dincer, G. D., Ari, S.,& Aydin, C. H. Trends in Distance Education Research: A Content Analysis of Journals 2009-2013. International Review of Research in Open and Distributed Learning. 2015, 16 (1): 330–363 [2017-05-10]. (原始内容存档于2019-03-27).