Gaya APA

Djumarna, U., S., K. (1969). Limestone deposits in Riau daratan Djambi northern part of South Sumatra, central & souteast Kalimantan and the southern part of west Irian. . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Djumarna, U.., S., Kadar. "Limestone deposits in Riau daratan Djambi northern part of South Sumatra, central & souteast Kalimantan and the southern part of west Irian.". Bandung: Pusat Sumber Daya Geologi, 1969. Bukan Logam.