1.
Colvin KF, Champaign J, Liu A, Zhou Q, Fredericks C, Pritchard DE. Learning in an introductory physics MOOC: All cohorts learn equally, including an on-campus class. IRRODL [Internet]. 2014Aug.15 [cited 2019May27];15(4). Available from: http://www.irrodl.org/index.php/irrodl/article/view/1902