ONNY FITRIANA SITORUS. The Importance of Cognitive Ability for Chair of Study Programs in Muhammadiyah University: Urgensi Kepemilikan Kemampuan Kognitif Keprodian Bagi Ketua Program Studi Di Perguruan Tinggi Muhammadiyah. Indonesian Journal of Education Methods Development, v. 7, p. 10.21070/ijemd.v5i1.41, 19 Aug. 2019.