Lua APA (7ú heag.)

Helder, C. (2014). The Ultimate book of Influence. Wiley India.

Lua i Stíl Chicago (17ú heag.)

Helder, Chris. The Ultimate Book of Influence. New Delhi: Wiley India, 2014.

Lua MLA (9ú heag.)

Helder, Chris. The Ultimate Book of Influence. Wiley India, 2014.

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