Somsak Koossalapeerom. (1976). Thailand's international economics relations with the four developed countries: A study trade and invesment. Faculty of Economics.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Somsak Koossalapeerom. Thailand's International Economics Relations with the Four Developed Countries: A Study Trade and Invesment. Thammasat University, Bangkok: Faculty of Economics, 1976.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Somsak Koossalapeerom. Thailand's International Economics Relations with the Four Developed Countries: A Study Trade and Invesment. Faculty of Economics, 1976.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.