Influence, New and Expanded : The Psychology of PersuasionRobert B. Cialdini,PhDThe foundational and wildly popular go-to resource for the science of influence and persuasion—a renowned international bestseller, with over 5 million copies sold—now revised adding: new research, new insights, new examples, and online applications.2026.4月 アメリカにて購入#影響力の武器