Von Hagen, V. W. (1949). Ecuador and the Galápagos Islands (First edition.). University of Oklahoma Press.
Chicagoスタイル(17版)引用形式Von Hagen, Víctor Wolfgang. Ecuador and the Galápagos Islands. First edition. Norman: University of Oklahoma Press, 1949.
MLA(8版)引用形式Von Hagen, Víctor Wolfgang. Ecuador and the Galápagos Islands. First edition. University of Oklahoma Press, 1949.
警告: この引用は必ずしも正確ではありません.