Gaya APA

Rahardjo, W., Sungkowo, A. (1992). Guide Book : Post Convention Field Trip 1992 Solo - Sangiran - Kedungombo December 10 th, 1992 (Tahun 1992). Jakarta: The Indonesian Association of Geologists.

Gaya MLA

Rahardjo, Wartono., Sungkowo, Andi. "Guide Book : Post Convention Field Trip 1992 Solo - Sangiran - Kedungombo December 10 th, 1992". Tahun 1992 Jakarta: The Indonesian Association of Geologists, 1992. Text.