Anything by Maria Montessori, and try the website for Montessori Internationale for some interesting articles

Children:The Challenge by Rudolph Dreikurs

Positive Discipline by Jane Nelson

How Children Fail & How Children Learn by John Holt

Why Gender Matters  by Leonard Sax

Endangered Minds by Jane Healy

The Elegant Universe by Brian Greene (Nova on PBS)

The Tipping Point, Blink, & Outliers by Malcolm Gladwell

Iron John & The Sibling Society by Robert Bly

Girlfighting by Lyn Mikel Brown

Cesar Milan’s coaching of people for assertiveness and leadership

Judith Martin

Ann Landers

Abigail Van Buren

some of Rabbi Schmuley’s work

goodatdoingthings.com