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Dr Abu Bkar Bhutta, Dr Muhammad Ismail, Dr Makkiah Nabi Bakhsh, Dr Raja Muhamad Zareef Khan, Dr Abdul Rahman, Dr Nasir Mehmood. Second Caliph Umar R.A, His Personality, Era and Reforms. (CEMJP) [Internet]. 2022 Dec. 30 [cited 2024 Nov. 22];30(4):2335-43. Available from: http://journals.kozminski.cem-j.org/index.php/pl_cemj/article/view/444