Gwendolyne, C. (2004). Water quality trend of Batang Kayan and its relation to anthropogenic activities.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gwendolyne, Christopher. Water Quality Trend of Batang Kayan and Its Relation to Anthropogenic Activities. 2004.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Gwendolyne, Christopher. Water Quality Trend of Batang Kayan and Its Relation to Anthropogenic Activities. 2004.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.