1. Official methods of analysis,1975
2. Barr, A. J., H. H. Goodnight, J. P. Sail, W. H. Blair, D. M. Chilko, J. T. Helwig, and K. A. Council. 1979. SAS User's guide. 1979 ed. SAS Inst. Inc., P. O. Box 10066, Raleigh, NC.
3. Goering, H. K., and P. J. Van Soest. 1970. Forage fiber analyses (apparatus, reagents, procedures, and some applications). US Dep. Agric. Agric. Handbook No. 379.
4. Storage and feeding of large hay packages for beef cows;Lechtenberg;J. Anim. Sci.,1974
5. Marley, S. J., C. Wilcox, and M. M. Danley. 1976. The storage characteristics of large round bales. Am. Soc. Agric. Eng. Paper No. MC-76-803. Am. Soc. Agric. Eng. St. Joseph, MI.