León-Páez, E. (1999). The bases of development and the value of ecotourism in Costa Rica.
シカゴスタイル引用形León-Páez, Eduardo. The Bases of Development and the Value of Ecotourism in Costa Rica. 1999.
MLA引用形式León-Páez, Eduardo. The Bases of Development and the Value of Ecotourism in Costa Rica. 1999.
警告: この引用は必ずしも正確ではありません.