How to Make Friends, According to Science

Robin Dunbar Friends: Understanding the Power of our Most Important Relationships

Kat Vellos We Should Get Together: The Secret to Cultivating Better Friendships

Kat Vellos We Should Get Together: The Secret to Cultivating Better Friendships

Why Is It Hard to Make Friends Over 30? (Published 2012)

Brian Wiesner and added

Eric Barker Barking Up the Wrong Tree: The Surprising Science Behind Why Everything You Know About Success Is (Mostly) Wrong

Agalia Tan added

Lisa Miller The Vexing Problem of the ‘Medium Friend’

Alex Burns added

Dale Carnegie How To Win Friends and Influence People

and added