Here are a few useful books. You can buy them for a few dollars at the online shop. However, you can save your money and earn these books as prizes when you vote in The Wisdom of The Crowd.
http://www.wisdomofthecrowd.sg/page/115
Click the link in the page to submit your votes on the current issues.
http://www.wisdomofthecrowd.sg/page/115
Click the link in the page to submit your votes on the current issues.
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