^Robert Barry, Amy Murcko, Cliff BrubakerThe Six Sigma Book for Healthcare : Improving Outcomes by Reducing Errors by Cliff Brubaker, Amy Murcko and Robert Barry (2002, Hardcover)ISBN 9781567931914 (revised Jun 2020)
^Barry, Robert (2014). The Six Sigma Book for Healthcare: Improving Outcomes by Reducing Errors, HEALTH ADMINISTRATION PRESS/ACHE. BiggerBooks. ISBN 9781567931914 (revised Jan 2024)
^ (2013). The Six Sigma Book for Healthcare: Improving Outcomes by Reducing ErrorsECampus. ISBN 9781567931914 (revised Jun 2020)