1. A Double Change-Over Design for Dairy Cattle Feeding Experiments;Cochran;Jour. Dairy Sci.,1941
2. Tests of Signifiance in Reversal or Switchback Trials;Brandt;Iowa Expt. Sta. Res. Bul.,1938
3. Statistical Methods;Snedecor,1938
4. The Design and Analysis of Factorial Experiments;Yates;Imp. Bur. Soil Sci., Tech. Commun.,1937