Qomariyah A, Samheri. The Validity of Sale and Purchase Contracts in the Al-Mujtama’ Islamic Boarding School, Pamekasan: A Study Based on Imam al-Shafi’i’s Al-Umm. JCPA [Internet]. 2026 Jul. 12 [cited 2026 Sep. 13];4(02):427-3. Available from: https://edujavare.com/index.php/jcpa/article/view/1645