Gaya APA

DEPOSIONAL STUDY OF THE LOWER KEUTAPANG SANDSTONE IN THE ARU AREA, NORRTH SUMATRA. (1976). Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

DEPOSIONAL STUDY OF THE LOWER KEUTAPANG SANDSTONE IN THE ARU AREA, NORRTH SUMATRA. . Bandung: Pusat Sumber Daya Geologi, 1976. Geologi Tata Lingkungan.