Cita APA (7a ed.)

PORTER MICHAEL E. (1998). ON COMPETITION. HARVERD BUSINESS SCHOOL.

Cita Chicago Style (17a ed.)

PORTER MICHAEL E. ON COMPETITION. BOSTON: HARVERD BUSINESS SCHOOL, 1998.

Cita MLA (9a ed.)

PORTER MICHAEL E. ON COMPETITION. HARVERD BUSINESS SCHOOL, 1998.