Gaya APA

Sumadi, K., Hejatmo, . (1981). Laporan Mengikuti The Thirtieth Annual Denver X-Ray Conference di University of Denver, Denver, Colorando . : Direktorat Jenderal Pertambangan Umum.

Gaya MLA

Sumadi, Kartiwa., Hejatmo, . "Laporan Mengikuti The Thirtieth Annual Denver X-Ray Conference di University of Denver, Denver, Colorando". : Direktorat Jenderal Pertambangan Umum, 1981. Text.