Zaaba Zainol Abidin. (1999). The identification of criteria and indicators for the sustainable management of ecotourism in Taman Negara National Park, Malaysia: A delphi consensus. West Virginia University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Zaaba Zainol Abidin. The Identification of Criteria and Indicators for the Sustainable Management of Ecotourism in Taman Negara National Park, Malaysia: A Delphi Consensus. Morgantown, West Virginia: West Virginia University, 1999.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Zaaba Zainol Abidin. The Identification of Criteria and Indicators for the Sustainable Management of Ecotourism in Taman Negara National Park, Malaysia: A Delphi Consensus. West Virginia University, 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.