50 Psychology Classics: Who We Are, How We Think, What We Do by Sigmund Freud (Author), Malcom Gladwell (Author), Carl Jung (Author), B.F. Skinner (Author), Tom Butler-Bowdon http://simbi.kemenag.go.id/pustaka/images/materibuku/50%20Psychology%20Classics.pdf
Paul Emmerson and Nick Hamilton https://projectbusinessenglishlessons.wikispaces.com/file/view/Five-Minute_Activities_for_Business_English.pdf/515902306/Five-Minute_Activities_for_Business_English.pdf