Nelson, k. E., Williams, C. M., & Graham, N. M. H. (2000). Infectious disease epidemiology: Theory and practice. Aspen Publishers.

Nelson, kenrad E., Carolyn Masters Williams, and Neil M. H. Graham. Infectious Disease Epidemiology: Theory and Practice. Gaithersburg, Md.: Aspen Publishers, 2000.

Nelson, kenrad E., et al. Infectious Disease Epidemiology: Theory and Practice. Aspen Publishers, 2000.