Koo, A. (1974). Projection of technical manpower requirements in the Public Works Departments, Singapore: A systems engineering approach.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Koo, Amy. Projection of Technical Manpower Requirements in the Public Works Departments, Singapore: A Systems Engineering Approach. 1974.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Koo, Amy. Projection of Technical Manpower Requirements in the Public Works Departments, Singapore: A Systems Engineering Approach. 1974.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.