1. “Official and Tentative Methods of the American Oil Chemists' Society,” 2nd ed., rev. to 1959, American Oil Chemists' Society, Chicago. Method Cb 1-25.
2. “Official and Tentative Methods of the American Oil Chemists' Society,” 2nd ed., rev. to 1959, American Oil Chemists' Society, Chicagoibid. Method Ca 9f-57.