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Crump JA, Sulka A, Langer A, Schaben C, Olsen SJ, Gage R, et al. Outbreak of Escherichia coli O157:H7 infections associated with farm visits, Pennsylvania, September-November 2000. In: CLINICAL INFECTIOUS DISEASES. 2001. p. 1234–1234.

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Crump JA, Sulka A, Langer A, Schaben C, Olsen SJ, Gage R, Chernak E, Crielly A, Baysinger CM, Johnston-Entsuah A, Laverdure K, Schmeck K, Herbert G, Smith K, Moll M, Rankin J, Berman R, Withers G, Reynolds S, Toney D, Carroll J, Hunter S, Van Duyne S, Greene KD, Bopp C, Hoekstra R, Van Gilder T. Outbreak of Escherichia coli O157:H7 infections associated with farm visits, Pennsylvania, September-November 2000. CLINICAL INFECTIOUS DISEASES. 2001. p. 1234–1234.