Reference

Allen, D. (2002): Getting Things Done: The Art of Stress-Free Productivity. Piatkus.
Covey, S. (1990): The 7 Habits of Highly Effective People. Free Press.
Covey, S., Merrill, A. R., and Merrill, R. R. (1996): First Things First. Free Press.
Tracy, B. (2007): Eat That Frog!: 21 Great Ways to Stop Procrastinating and Get More Done in Less Time. Berrett-Koehler Publishers.