The effect of problem-based video instruction on learner satisfaction, comprehension and retention in college courses. - Hee Jun Choi; Scott D. Johnson (Br. J. Educ. Technol., 2007)

Factors Influencing Adult Learners' Decision to Drop Out or Persist in Online Learning. - Ji-Hye Park; Hee Jun Choi (J. Educ. Technol. Soc., 2009)

Testing a path-analytic model of adult dropout in online degree programs. - Hee Jun Choi; Ji-Hye Park (Comput. Educ., 2018)