Behr, K., Kim, G., & Spafford, G. (2010). The visible OPS handbook: Implementing ITIL in practical and auditable steps (First edition revised.). IT Process Institute.

Behr, Kevin, Gene Kim, and George Spafford. The Visible OPS Handbook: Implementing ITIL in Practical and Auditable Steps. First edition revised. Oregon: IT Process Institute, 2010.

Behr, Kevin, et al. The Visible OPS Handbook: Implementing ITIL in Practical and Auditable Steps. First edition revised. IT Process Institute, 2010.