Walid Ahmed. Impact study of sustainable livelihood projects in Yemen: The case of al-Hiswa and Jabal Bura'a sustainable natural resources management programs.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Walid Ahmed. Impact Study of Sustainable Livelihood Projects in Yemen: The Case of Al-Hiswa and Jabal Bura'a Sustainable Natural Resources Management Programs.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Walid Ahmed. Impact Study of Sustainable Livelihood Projects in Yemen: The Case of Al-Hiswa and Jabal Bura'a Sustainable Natural Resources Management Programs.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.