Lua APA (7ú heag.)

Porter, M. E. (1998). On competition. Harvard Businesss School Publishing.

Lua i Stíl Chicago (17ú heag.)

Porter, Michael E. On Competition. Boston: Harvard Businesss School Publishing, 1998.

Lua MLA (9ú heag.)

Porter, Michael E. On Competition. Harvard Businesss School Publishing, 1998.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.