[en] The 5 Levels of Leadership Center Street
[en] Today Matters Center Street
[en] Becoming a Person of Influence Harpercollins Leadership
[en] [Successful People 01] • How Successful People Think Center Street
[en] [Successful People 01] • Thinking for a Change FaithWords
[en] A Leader's Heart Thomas Nelson
[en] Attitude 101 Harpercollins Leadership
[en] 25 Ways to Win With People Harpercollins Leadership
[en] Savage Beasts Grey Matter Press
[en] Neuroscience and Philosophy · Brain, Mind, and Language Columbia University Press
[en] The Enlightenment Quest and the Art of Happiness North Atlantic Books
[en] Eros Ascending Frog Books
[en] Ethics 101 · What Every Leader Needs to Know Center Street
[en] Talent Is Never Enough & Becoming a Person of Influence Thomas Nelson Publishers
[en] The 5 Levels of Leadership · Proven Steps to Maximize Your Potential Center Street
[en] The 21 Indispensable Qualities of a Leader Nelson Books
[en] Be All You Can Be · A Challenge to Stretch Your God-Given Potential David C Cook
[en] The 360 Degree Leader with Workbook HarperCollins Leadership