Howe, A. D., Forster, S., Morton, S., Marshall, R., Osborn, K. S., Wright, P., & Hunter, P. R. (2002). Cryptosporidium Oocysts in a Water Supply Associated with a Cryptosporidiosis Outbreak. Centers for Disease Control and Prevention.

Howe, Andrew D., Sue Forster, Stephen Morton, Roberta Marshall, Keith S. Osborn, Peter Wright, i Paul R. Hunter. Cryptosporidium Oocysts in a Water Supply Associated With a Cryptosporidiosis Outbreak. Centers for Disease Control and Prevention, 2002.

Howe, Andrew D., et al. Cryptosporidium Oocysts in a Water Supply Associated With a Cryptosporidiosis Outbreak. Centers for Disease Control and Prevention, 2002.