Petrick, M., & Weingarten, P. (2004). The role of agriculture in Central and Eastern European rural development: engine of change or Social buffer?: Studies on the agricultural and food sector in Central and Eastern Europe. Vol. 25.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Petrick, Martin, و Peter Weingarten. The Role of Agriculture in Central and Eastern European Rural Development: Engine of Change or Social Buffer?: Studies on the Agricultural and Food Sector in Central and Eastern Europe. Vol. 25. 2004.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Petrick, Martin, و Peter Weingarten. The Role of Agriculture in Central and Eastern European Rural Development: Engine of Change or Social Buffer?: Studies on the Agricultural and Food Sector in Central and Eastern Europe. Vol. 25. 2004.
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