Attitude Quotes - Page 185
Clayton M. Christensen (2017). “How Will You Measure Your Life? (Harvard Business Review Classics)”, p.14, Harvard Business Review Press
Clayton M. Christensen, Harvard Business Review (2016). “The Clayton M. Christensen Reader”, p.203, Harvard Business Review Press
Charles R. Swindoll (2007). “Great Days with the Great Lives: Daily Insight from Great Lives of the Bible”, p.34, Thomas Nelson Inc