Mohd Sa’afie, A., and M. Z. Muda. “The Variety Of Hibah As An Wealth Planning Instrument: A Literature Review: Kepelbagaian Produk Hibah Sebagai Instrumen Perancangan Harta: Sorotan Literatur”. Al-Qanatir: International Journal of Islamic Studies, vol. 10, no. 1, May 2018, pp. 31-41, https://www.al-qanatir.com/aq/article/view/3.