Chew, K. L. (1993). Study of major air, sea freight fowarders and shipping agents in Singapore and their financial needs and requirements.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Chew, Kok Leong. Study of Major Air, Sea Freight Fowarders and Shipping Agents in Singapore and Their Financial Needs and Requirements. 1993.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Chew, Kok Leong. Study of Major Air, Sea Freight Fowarders and Shipping Agents in Singapore and Their Financial Needs and Requirements. 1993.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.