Ahmed, M. E. Y. (2004). Aspects of climatic change, air quality degradation and acid rain in the Klang Valley Region, Malaysia. Fakulti Sains Sosial Dan Kemanusiaan, Universiti Kebangsaan Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ahmed, Mohamed Elnour Yassen. Aspects of Climatic Change, Air Quality Degradation and Acid Rain in the Klang Valley Region, Malaysia. Bangi: Fakulti Sains Sosial Dan Kemanusiaan, Universiti Kebangsaan Malaysia, 2004.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ahmed, Mohamed Elnour Yassen. Aspects of Climatic Change, Air Quality Degradation and Acid Rain in the Klang Valley Region, Malaysia. Fakulti Sains Sosial Dan Kemanusiaan, Universiti Kebangsaan Malaysia, 2004.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.