Pettinger, R. (1996). Introduction to Corporate Strategy. Macmillan Business.
Lua i Stíl Chicago (17ú heag.)Pettinger, Richard. Introduction to Corporate Strategy. Hampshire: Macmillan Business, 1996.
Lua MLA (9ú heag.)Pettinger, Richard. Introduction to Corporate Strategy. Macmillan Business, 1996.
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