Mohd Asri, N. F., S. N. Sha’ri, N. A. Yaacob, Z. Seruji, and R. Abdul Ghani. “Aplikasi 4P Dalam Pemasaran Buku Ilmiah Bahasa Melayu Oleh Penerbit Universiti Awam Terpilih: 4P Application in Marketing Malay Language Books by Selected Public University Publisher”. The Journal of Social Analysis and Sustainability Studies (JSASS), vol. 6, no. 1, June 2019, pp. 226-3, https://jsass.uis.edu.my/index.php/jsass/article/view/88.