By Kathy Furgang
By National Geographic Kids
By National Geographic Kids'
By Frankfort-Nachmias C.
By Harbo, Christopher L.
By Woolf, Alex
By Kizza, Joseph Migga
By Barbour J.
By Brooke-Hitching, Edward
By Jim Eldridge
By Ian Goldin and Chris Kutarna
By Ridge, Sophy
By Alvesson, Mats, Sköldberg, Kaj
By Shariatmadari, David
By Dashti, Naseer
By Emerson, Clint
By Kagume, Krista, Campbell PhD, Wayne, Kennedy, Gregory
By Rutledge, Leigh W.
By Prechtel, Martin
By Herbert, Janis
By CLAUDIA ZASLAVS
By Washington, George
By Pettit, Philip, Goodin, Robert E.
By American Psychological Association
By O'Brien, Mary Barmeyer
By Heyman, I.Michael
By John Gray
By Zinn, Howard, Barsamian, David