Gaya APA

Pearce, J, A., Robinson, R, B. (1991). Formulation, implementation, and control of competitive strategy (4th ed). Homewood, IL: Irwin.

Gaya MLA

Pearce, John, A.., Robinson, Richard, B.. "Formulation, implementation, and control of competitive strategy". 4th ed Homewood, IL: Irwin, 1991. Text.