Gaya APA

SImkin, T. (1981). Volcanoes of The World : A Regional Directory, Gazetteer, and Chronology of Volcanism During The Last 10.000 Years . PENNSYLVANIA: Huthinson Ross Publishing Company.

Gaya MLA

SImkin, Tom. "Volcanoes of The World : A Regional Directory, Gazetteer, and Chronology of Volcanism During The Last 10.000 Years". PENNSYLVANIA: Huthinson Ross Publishing Company, 1981. Text.