Newbie -- suggest a Linux book and give guidelines

Hi, I am excited to become a member of this well known and esteemed forum. I have started learning Linux a few days back. Basically i have completed my Masters degree in Economics. Currently i am working as a teacher in a private school. Any body who can suggest me a good book on linux for beginners. Which includes examples and cheet sheets. I want to practice but i need material to get help . I shall be so thankful for your time and guidelines.