Sawyer, L. B., Scheiner, J. H., Dittenhofer, M. A., Graham, A., & Makosz, P. (2005). Sawyer's internal audtiting: The practice of modern internal auditing (5th ed.). Florida: The Institute of Internal Auditors.

Sawyer, Lawrence B., James H. Scheiner, Mortimer A. Dittenhofer, Anne Graham, and Paul Makosz. Sawyer's Internal Audtiting: The Practice of Modern Internal Auditing. 5th ed. Florida: The Institute of Internal Auditors, 2005.

Sawyer, Lawrence B., et al. Sawyer's Internal Audtiting: The Practice of Modern Internal Auditing. 5th ed. Florida: The Institute of Internal Auditors, 2005.