APA (7e ed.) Bronvermelding

Walker, G. (2003). Modern competitive strategy (International ed.). McGraw-Hill Education (Asia).

Chicago (17e ed.) Bronvermelding

Walker, Gordon. Modern Competitive Strategy. International ed. Singapore: McGraw-Hill Education (Asia), 2003.

MLA (9e ed.) Bronvermelding

Walker, Gordon. Modern Competitive Strategy. International ed. McGraw-Hill Education (Asia), 2003.