1. Crohn’s disease in humans and Johne’s disease in cattle—Linked diseases?;Barkema,2010
2. Barkema, H. W., K. Orsel, A. Koets, V. P. Rutten, J. Bannantine, G. P. Keefe, D. F. Kelton, S. J. Wells, R. Whittington, C. G. Mackintosh, E. J. Manning, M. F. Weber, J. P. Kastelic, and J. De Buck. 2014. Bottlenecks in the prevention and control of Mycobacterium avium ssp. paratuberculosis infection. Pages 111–113 in Proc. 12th Int. Colloq. Paratuberculosis, Parma, Italy.
3. Management style and its association with bulk milk somatic cell count and incidence rate of clinical mastitis;Barkema;J. Dairy Sci.,1999
4. From Practice to Grounded Theory: Qualitative Research in Nursing;Chenitz,1986
5. Successful control of Johne's disease in nine dairy herds: Results of a six-year field trial;Collins;J. Dairy Sci.,2010