True Influence
Rosa Parks: Networks and the Power of Weak Ties (from The Power of Habit: Why We Do What We Do in Life and Business by Charles Duhigg)
The Strength of Weak Ties (Mark Granovetter, American Journal of Sociology V. 78, 1973-May, pages 1360-1380)
Five ways to get better leads from your networking group (Improv Andy)