Gaya APA

Lange, O., Jayaporhas, I, I, M, I, L, N, Ã, I, S, E. (1991). Geologi umum . Jakarta: Jakarta: Gaya Media Pratama; 1991.

Gaya MLA

Lange, O.., Jayaporhas, I., Ivanova,, M., II., Lebedeva,, N., ì, III., Silitonga,, Eric. "Geologi umum". Jakarta: Jakarta: Gaya Media Pratama; 1991, 1991. Text.