1. Social considerations in grouping cows;Albright,1978
2. Effect of diet on short-term regulation of feed intake by lactating dairy cattle;Allen;J. Dairy Sci.,2000
3. Allen, M. S. 2008. Time to regroup. Michigan Dairy Review. Accessed Mon, Day, Year. https://www.msu.edu/~mdr/reprints/April08/timetoreprintapr08.pdf
4. Grouping to increase milk yield and decrease feed costs;Allen,2009
5. Cattle behavior;Arave;J. Dairy Sci.,1981