APA Format
23014. (Jakarta: PTIK, 1991). Practical English for Police. :
MLA Format
23014. Practical English for Police. : , Jakarta: PTIK, 1991
Chicago Format
23014. Practical English for Police. : , Jakarta: PTIK, 1991
Australian/Harvard Format
23014. Jakarta: PTIK, 1991. Practical English for Police.