Ee, B. S. Y. (1998). An investigation of design, time and variation provisions under the North-East line conditions of contract.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ee, Benjamin Seck Yong. An Investigation of Design, Time and Variation Provisions Under the North-East Line Conditions of Contract. 1998.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ee, Benjamin Seck Yong. An Investigation of Design, Time and Variation Provisions Under the North-East Line Conditions of Contract. 1998.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.