Helder, C. (2014). The Ultimate book of Influence. Wiley India.
Chicago-čujuhus (17. p.)Helder, Chris. The Ultimate Book of Influence. New Delhi: Wiley India, 2014.
MLA-čujuhus (9. p.)Helder, Chris. The Ultimate Book of Influence. Wiley India, 2014.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.