Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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