APA Style
Kubbah, Abdul Amir Q.. ().
Opec past and present .
Petro:
Economic research centre.
Chicago Style
Kubbah, Abdul Amir Q..
Opec past and present.
Petro:
Economic research centre,
.
Buku.
MLA Style
Kubbah, Abdul Amir Q..
Opec past and present.
Petro:
Economic research centre,
.
Buku.
Turabian Style
Kubbah, Abdul Amir Q..
Opec past and present.
Petro:
Economic research centre,
.
Buku.