Jittima Pongpojkasem. (1979). The Effectiveness of agricultural incentives in Thailand: A case study of rice, maize, cassava and sugar a theses. Thammasat University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Jittima Pongpojkasem. The Effectiveness of Agricultural Incentives in Thailand: A Case Study of Rice, Maize, Cassava and Sugar a Theses. Bangkok: Thammasat University, 1979.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Jittima Pongpojkasem. The Effectiveness of Agricultural Incentives in Thailand: A Case Study of Rice, Maize, Cassava and Sugar a Theses. Thammasat University, 1979.
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