Restificar, S. D. F. (2004). Developing a framework for a sustainable use of tropical karst landscape: The case of Puerto Princesa Subterranean River National Park, Philippines. University of Wisconsin.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Restificar, Sonata Dulce Figueroa. Developing a Framework for a Sustainable Use of Tropical Karst Landscape: The Case of Puerto Princesa Subterranean River National Park, Philippines. Milwaukee, Wisconsin: University of Wisconsin, 2004.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Restificar, Sonata Dulce Figueroa. Developing a Framework for a Sustainable Use of Tropical Karst Landscape: The Case of Puerto Princesa Subterranean River National Park, Philippines. University of Wisconsin, 2004.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.