Gaya APA

PERMANA, A. et al (2013). Lithotype and chemical characteristic of the south walker creek coals, bowen basin, australia . Bandung: Pusat Survei Geologi, Badan Geologi.

Gaya MLA

PERMANA, A.K. et al. "Lithotype and chemical characteristic of the south walker creek coals, bowen basin, australia". Bandung: Pusat Survei Geologi, Badan Geologi, 2013. Artikel.