Six، J.؛ Elliott، E. T.؛ Paustian، K. (1 مايو 2000). "Soil Structure and Soil Organic Matter II. A Normalized Stability Index and the Effect of Mineralogy". Soil Science Society of America Journal. ج. 64 ع. 3: 1042–1049. DOI:10.2136/sssaj2000.6431042x. ISSN:1435-0661.
Six، J.؛ Elliott، E. T.؛ Paustian، K. (1 مايو 2000). "Soil Structure and Soil Organic Matter II. A Normalized Stability Index and the Effect of Mineralogy". Soil Science Society of America Journal. ج. 64 ع. 3: 1042–1049. DOI:10.2136/sssaj2000.6431042x. ISSN:1435-0661.