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. ijemd 2019, 7, 10.21070/ijemd.v5i1.41. https://doi.org/10.21070/ijemd.v5i1.41.