The Existence of President Instruction of the Republic of Indonesia Number 1 the Year 1991 on the Wide Spread of Compilation of Islamic Law in Indonesian Legal System merupakan karya Fajar Sugianto dan Slamet Suhartono yang dimuat dalam al-ihkam Jurnal Hukum dan Pranata Sosial Vol. 13 No. 2 December 2018. Karya ini diterbitkan oleh The Islamic Law Researcher Association (APHI) collaboration with Faculty of Sharia IAIN Madura.
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