Mohammed Ahmed, O. B. E. (2010). Comparison of continuous dynamics probing with the standard penetration test for highly weathered limestone of eastern Sudan.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Mohammed Ahmed, Omar Babiker Elhaj. Comparison of Continuous Dynamics Probing with the Standard Penetration Test for Highly Weathered Limestone of Eastern Sudan. 2010.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Mohammed Ahmed, Omar Babiker Elhaj. Comparison of Continuous Dynamics Probing with the Standard Penetration Test for Highly Weathered Limestone of Eastern Sudan. 2010.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.