(2006). World reference base for soil resources 2006: A framework for international classification, correlation and communication. Food and agriculture organization of the United Nations.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)World Reference Base for Soil Resources 2006: A Framework for International Classification, Correlation and Communication. Rome: Food and agriculture organization of the United Nations, 2006.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)World Reference Base for Soil Resources 2006: A Framework for International Classification, Correlation and Communication. Food and agriculture organization of the United Nations, 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.