I am having problems determiming how to draw out an entity relation diagram. Can you help?

http://www.google.com/search?q=entity+relation+diagram&biw=1920&bih=955&tbm=isch&tbo=u&source=univ&sa=X&ei=Y4h_VPaGJoSoyQT0g4HgBg&ved=0CB0QsAQ