Gaya APA

Park, U. et al (1993). Coal Geology : Exploration, Resources And The Enviroment A Short Course Internationam Scientists . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Park, Univercity. et al. "Coal Geology : Exploration, Resources And The Enviroment A Short Course Internationam Scientists". Bandung: Pusat Sumber Daya Geologi, 1993. Batubara.