Gaya APA

Ridder, A. (1981). The Socio Economics of Sunda Strait With Special Notes to The Tourism Aspect of The Krakatau Volcano Island . Jakarta, Indonesia: Pusat Vulkanologi dan Mitigasi Bencana Geologi.

Gaya MLA

Ridder, Axel. "The Socio Economics of Sunda Strait With Special Notes to The Tourism Aspect of The Krakatau Volcano Island". Jakarta, Indonesia: Pusat Vulkanologi dan Mitigasi Bencana Geologi, 1981. Text.