TY  - BOOK
AU  - Umar Hafiz
TI  - 4 pemimpin ajaib Khulafa' Ar Rasyiddin: Abu Bakar, Umar, Usman, Ali 
SN  - 9789833764747
PY  - 2011///
CY  - Batu Caves, Selangor
PB  - Pustaka Al-Ehsan
KW  - Muhammad,
KW  - Caliphate
ER  -