Levinson, S. The power to get things done. Perigee.
Lua i Stíl Chicago (17ú heag.)Levinson, Steve. The Power to Get Things Done. Perigee.
Lua MLA (9ú heag.)Levinson, Steve. The Power to Get Things Done. Perigee.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.