Merging MOOC and mLearning for Increased Learner Interactions. - Inge De Waard; Apostolos Koutropoulos; Rebecca J. Hogue; Sean C. Abajian; Nilgün Özdamar Keskin; C. Osvaldo Rodriguez; Michael Sean Gallagher (Int. J. Mob. Blended Learn., 2012)

What Tweets Tell us About MOOC Participation. - Apostolos Koutropoulos; Sean C. Abajian; Inge De Waard; Rebecca J. Hogue; Nilgün Özdamar Keskin; C. Osvaldo Rodriguez (Int. J. Emerg. Technol. Learn., 2014)

Rethinking Lurking. - Apostolos Koutropoulos; Sarah Honeychurch; Lenandlar Singh (eLearn Mag., 2019)

On lurking: Multiple perspectives on lurking within an educational community. - Aras Bozkurt; Apostolos Koutropoulos; Lenandlar Singh; Sarah Honeychurch (Internet High. Educ., 2020)