Cita APA (7a ed.)

Porter, M. E. (1991). Michael E. Porter on competition and strategy. Harvard Business School.

Cita Chicago Style (17a ed.)

Porter, Michael E. Michael E. Porter on Competition and Strategy. Boston, Massachusetts: Harvard Business School, 1991.

Cita MLA (9a ed.)

Porter, Michael E. Michael E. Porter on Competition and Strategy. Harvard Business School, 1991.