How to run the long run - Read here! - Inspiration
David Willey
Add a weekly medium-long run to boost endurance - Canadian Running Magazine
Short Runs and Their Surprising Health Benefits
How long should your run last?
Dawg Gone Long Run 50 KM Top Times
Motherhood Made Me A Smarter (And Faster) Runner
Hear From a Sports Medicine Professional: How Long at What Pace Should Your Long Runs Be?
The Marathon Long Run
Yared Nuguse, World Championship 1,500-Meter Contender, Runs for Fun - The New York Times
How to Train for a Marathon
The Long Run 2012