APA (7th ed.) Citation

Gray, P. (1991). Open Systems: Business Strategy for the 1990. McGraw-Hill.

Chicago Style (17th ed.) Citation

Gray, Pamela. Open Systems: Business Strategy for the 1990. London: McGraw-Hill, 1991.

MLA (9th ed.) Citation

Gray, Pamela. Open Systems: Business Strategy for the 1990. McGraw-Hill, 1991.