Harvard Business Review. (1991). Motivation. Harvard Business School Publishing.
Lua i Stíl Chicago (17ú heag.)Harvard Business Review. Motivation. Boston, Mass: Harvard Business School Publishing, 1991.
Lua MLA (9ú heag.)Harvard Business Review. Motivation. Harvard Business School Publishing, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.