Lua APA (7ú heag.)

Bryce, D. J. Competing against free. Harvard Business Review.

Lua i Stíl Chicago (17ú heag.)

Bryce, David J. "Competing Against Free." Harvard Business Review .

Lua MLA (9ú heag.)

Bryce, David J. "Competing Against Free." Harvard Business Review, .

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