Worthington, I., & Britton, C. (2009). The business environment (6th ed.). FT Prentice Hall.

Worthington, Ian, and Chris Britton. The Business Environment. 6th ed. Harlow, England ; New York: FT Prentice Hall, 2009.

Worthington, Ian, and Chris Britton. The Business Environment. 6th ed. FT Prentice Hall, 2009.