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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”, ijemd, vol. 7, p. 10.21070/ijemd.v5i1.41, Aug. 2019.