Gypmantasiri, P., Wiboonpongse, A., Rerkasem, B., & Craig, I. (1980). An interdisciplinary perspective of cropping systems in the Chiang Mai Valley: Key questions for research. Faculty of Agriculture, University of Chiang Mai.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gypmantasiri, Phrek, Aree Wiboonpongse, Benjavan Rerkasem, و Iain Craig. An Interdisciplinary Perspective of Cropping Systems in the Chiang Mai Valley: Key Questions for Research. Thailand: Faculty of Agriculture, University of Chiang Mai, 1980.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Gypmantasiri, Phrek, et al. An Interdisciplinary Perspective of Cropping Systems in the Chiang Mai Valley: Key Questions for Research. Faculty of Agriculture, University of Chiang Mai, 1980.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.