Wharton, M.; Spiegel, R. A.; Horan, J. M.; Tauxe, R. V.; Wells, J. G.; Barg, N.; Herndon, J.; Meriwether, R. A.; MacCormack, J. N.; Levine, R. H. (1990-12-01). "A Large Outbreak of Antibiotic-Resistant Shigellosis at a Mass Gathering". Journal of Infectious Diseases. 162 (6). Oxford University Press (OUP): 1324–1328. doi:10.1093/infdis/162.6.1324. ISSN0022-1899. PMID2230262.