1. Al Hilli, A. (1956). Al Tadhkirah al-Fuqaha, Al-Maktabat Al-Murtadawiyya Tehran, Iran, Volume 1. Retrieved from http://iranbuybook.com/9789643195243
2. Al-Sadr, M. B. (1982). Iqtisaduna: Our Economics, 2 vols. Tehran: World Organization for Islamic Services, 84.
3. Al Tabbatabi, M. K. Al Yazdi (Ayatollah Syed). (1957). Al Urwa Al Wusqa, Haddriya Publisher, Tehran, Iran, 3rd Ed.
4. Brennan, P. (2017). WAQF: Perpetual and Inalienable Islamic Endowments a Practical Introduction.