Gaya APA
Davey, R, C. (1997).
Developing An Efficient Energy Market The Role Of The Regulatory Framework .
Jakarta:
Pusat Sumber Daya Geologi.
Gaya MLA
Davey, Robin, C.
"Developing An Efficient Energy Market The Role Of The Regulatory Framework".
Jakarta:
Pusat Sumber Daya Geologi,
1997.
Batubara.