62 books • 3 series
Book #1: Self-Discipline in Difficult Times
Book #1: How to Build Self-Discipline
Book #2: Daily Self-Discipline
Book #3: Self-Disciplined Dieter
Book #4: How to Build Self-Discipline to Exercise
Book #5: 365 Days With Self-Discipline
Book #5: Self-Discipline for Entrepreneurs
Book #8: Self-Discipline for Writers