Gulick, L. H., & Urwick, L. F. (2003). Papers on the science of administration (2nd ed.). Routledge.

Gulick, Luther Halsey, and Lyndall F. Urwick. Papers on the Science of Administration. 2nd ed. London ; New York: Routledge, 2003.

Gulick, Luther Halsey, and Lyndall F. Urwick. Papers on the Science of Administration. 2nd ed. Routledge, 2003.