APA (7th ed.) Citation

Hughes, T., & William, T. (1991). Quality assurance: A framework to build on. BSP Professional Books.

Chicago Style (17th ed.) Citation

Hughes, Terry, and Trefor William. Quality Assurance: A Framework to Build on. Oxford: BSP Professional Books, 1991.

MLA (8th ed.) Citation

Hughes, Terry, and Trefor William. Quality Assurance: A Framework to Build on. BSP Professional Books, 1991.