Baktsir, A. A. (1987). Sejarah kepemimpinan Umar. Pustaka Mantiq.
Chicago Style (17th ed.) CitationBaktsir, Ali Ahmad. Sejarah Kepemimpinan Umar. Pustaka Mantiq, 1987.
MLA (8th ed.) CitationBaktsir, Ali Ahmad. Sejarah Kepemimpinan Umar. Pustaka Mantiq, 1987.
Warning: These citations may not always be 100% accurate.