Quality Characteristics of Midwestern Soybeans. Charles R. Hurburgh, Jr., Lynn N. Paynter and Steven G. Schmitt.
Quality of the 2003 Soybean Crop from the United States. (PDF) Thomas J. Brumm and Charles R. Hurburgh.
Quality of US Soybean Meal Compared to the Quality of Soybean Meal from Other Origins.Maitri Thakur, Iowa State University May 2006.