This short listen is recommended by David Ogilvy, Jay Abraham, and many other masters of marketing. It contains many principles that are common in Internet marketing today, such as the idea of testing and measuring ad effectiveness, writing to one person, understanding and using psychology, etc.
"very difficult to follow"
My Life in Advertising is an autobiography detailing the life of advertising genius Claude C. Hopkins (author of the business classic Scientific Advertising). This book is not written as a personal history, but as a business story. The chief object behind every chapter is to offer helpful suggestions to those who will follow his advice. As practical as it is interesting, My Life in Advertising is a must-listen book for anyone wanting to understand the secrets of how to sell.
Scientific Advertising was written by Claude C. Hopkins in 1923 and is cited by many of advertising and marketing personalities (such as David Ogilvy, Gary Halbert, and Jay Abraham) as a "must-read" book.