Sách nói: Pep: Poise, Efficiency, Peace

Colonel William Crosbie Hunter was a businessman and self-help writer who was moderately popular in the early 20th century. His books set forth his personal philosophy on health, happiness, human relations, and success in the business world. Pep, billed as "A book of how's not why's for physical and mental efficiency," was published in 1914 and went through several editions. (Introduction by Pleonic)