Gaya APA

Koyanagi, R, Y. et al (1988). USGS/USAID Suport of the Seismic Program at the Merapi Volcano Observatory, May - June 1988. . Bandung: Pusat Vulkanologi dan Mitigasi Bencana Geologi.

Gaya MLA

Koyanagi, Robert, Y.. et al. "USGS/USAID Suport of the Seismic Program at the Merapi Volcano Observatory, May - June 1988.". Bandung: Pusat Vulkanologi dan Mitigasi Bencana Geologi, 1988. Text.