1. Tests of Significance in Reversal or Switchback Trials;Brandt;Iowa Agr. Expt. Sta., Research Bull.,1938
2. Oats, Peas and Vetch for Hay and Silage in North Dakota;Carter;North Dakota Agr. Expt. Sta., Bull.,1964
3. Gaalaas, R. F., and Rogler, G. A. 1955. Grazing and Gass-Silage Feeding Studies at the Northern Great Plains Dairy Station. USDA, Tech. Bull. 1115.
4. Effect of Seeding Rates and Time of Harvest on Yield and Quality of Oat-Pea Forage;Hodgson;Agron. J.,1956
5. The Feeding Value of Pea and Oat Silage for Dairy Cows;Huffman;Michigan Agr. Expt. Sta., Quart. Bull.,1954