Influence: The Psychology of Persuasion by Robert Cialdini is a classic book that explores the principles of persuasion and how they can be applied to e-commerce businesses. Cialdini explains the six universal principles of influence - reciprocity, scarcity, authority, consistency, liking, and consensus - and provides real-world examples of how they can be used to influence customer behavior and drive sales. This book is essential for business owners and marketers looking to understand the psychology behind consumer decision-making and apply it to their e-commerce strategies.