Gaya APA
khairatullah, A.
().
Jejak Khulafaur Rasyidin 2 Umar Bin Khathab
.
Jakarta:
niaga swadaya.
Gaya MLA
khairatullah, Abdulkarim.
"Jejak Khulafaur Rasyidin 2 Umar Bin Khathab ".
Jakarta:
niaga swadaya,
.
Text.