"The Happy Introvert – A Wild and Crazy Guide for Celebrating Your True Self" was published in 2006. She included a section on the movie "Napoleon Dynamite", along with chapters on relationships, children, Jung, neurology, personality, and creativity. Kathleen Grant Geib reviewed it as, "A delightful and informative guide for folks who call themselves introverts. Wagele sheds lights on differences between extroverts and introverts (25 to 30 percent of the U.S. population) and introduces main points of the fascinating personality survey, the Myers-Briggs Type Indicator. Fun illustrations add humor."