Gaya APA
Pertamina, . (1974).
Pertamina Indonesian state oil enterprise(reference book second edition) (1974).
:
Pertamina public relations departmnet.
Gaya MLA
Pertamina, .
"Pertamina Indonesian state oil enterprise(reference book second edition)".
1974
:
Pertamina public relations departmnet,
1974.
Text.