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Khulel, Buyun and Khoiruddin, As'ad (2019) Strategi Pemantapan dan Percepatan Skor TOEFL. PT Optima.
Hasbullah, Muhammad Afif and Wangi, Nisaul Barokati Seliro and Pradana, Muhammad Syaiful and Khulel, Buyun and Hudi, Moh Peer Review : Quality and Affordable Education through Quality Management Systems in Higher Education. Universitas Islam Darul 'ulum. (Unpublished)
Hasbullah, Muhammad Afif and Selirowangi, Nisaul Barokati and Pradana, Mohammad Syaiful and Khulel, Buyun and Hudi, Moh Quality and Affordable Education through Quality Management Systems in Higher Education. Unisda. (Unpublished)
Hasbullah, Muhammad Afif and Selirowangi, Nisaul Barokati and Pradana, Muhammad Syaiful and Khulel, Buyun and Hudi, Moh Turnitin : Quality and Affordable Education through Quality Management Systems in Higher Education. Universitas Islam Darul 'ulum. (Unpublished)