Gaya APA

dkk, A, D. (1984). Merapi Monthly Report of April - May 1984 (May 1984). Bandung: Direktorat Vulkanologi.

Gaya MLA

dkk, A., Djumarma,. "Merapi Monthly Report of April - May 1984". May 1984 Bandung: Direktorat Vulkanologi, 1984. Text.