1. Social considerations in grouping cows;Albright,1978
2. Allen, M. S. 2009. Grouping to increase milk yield and decrease feed costs. Pages 61–65 in Proc. Tri-State Dairy Nutr. Conf., Ft. Wayne, IN. The Ohio State University, Columbus.
3. Research Methods in Health. Investigating Health and Health Services;Bowling,2009
4. Cabrera, V. E., F. Contreras, R. D. Shaver, and L. Armentano. 2012. Grouping strategies for feeding lactating dairy cattle. Pages 40–44 in Proc. Four-State Dairy Nutr. Manag. Conf., Dubuque, IA. University of Wisconsin Extension, Madison.
5. Effect of animal grouping on feeding behavior and intake of dairy cattle;Grant;J. Dairy Sci.,2001