1. Muhammadiyah University of West Sumatera, Padang, Indonesia
2. Islamic State University of Imam Bonjol Padang, Padang, Indonesia
3. Department of English Language, Islamic Azad University, Fasa, Iran
4. Universitas Islam Negeri Maulana Malik Ibrahim Malang, Malang, Indonesia
5. Institute Agama Islam Negeri Curup, Bengkulu, Indonesia