P. L. Enright, D. L. Sherrill: Reference equations for the six-minute walk in healthy adults. In: Am. J. Respir. Crit. Care Med. Band 158, Nummer 5 Pt 1, November 1998, S. 1384–1387, doi:10.1164/ajrccm.158.5.9710086, PMID 9817683.
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P. L. Enright, D. L. Sherrill: Reference equations for the six-minute walk in healthy adults. In: Am. J. Respir. Crit. Care Med. Band 158, Nummer 5 Pt 1, November 1998, S. 1384–1387, doi:10.1164/ajrccm.158.5.9710086, PMID 9817683.