Turnbull, P. 1990. Anthrax. Pp. 364 in Topley and Wilson’s Principles of Bacteriology, Virology and Immunity, 8th Edition. Vol. 3. G.R. Smith and C.R. Easmon, eds. Sevenoaks, England: Edward Arnold.
Wherle, P.F., J.J. Posch, K.H. Richter, and D.A. Henderson. 1970. An airborne outbreak of smallpox in a German hospital and its significance with respect to other recent outbreaks. Bulletin World Health Organization 43: 2230-2251.
White, D.O. and F.J. Fenner. 1994. Medical Virology. San Diego, California: Academic Press.
Willeke, K., and J.M. Macher. 1999. Air Sampling. Ch. 11 in Bioaerosols: Assessment and Control, J. Macher, ed. Cincinnati, Ohio: American Conference of Governmental Industrial Hygienists.