Championed by business tycoon Warren Buffett, utilised by former Soviet leader Mikhail Gorbachev and exploited by the murderous cult leader, Charles Manson, the self help book, How to Win Friends and Influence People by Dale Carnegie is almost 90 and has sold many millions of copies since 1936.
It was a surprise bestseller when it was first published in depression era United States to a readership hungry for advice for making it big in corporate America. It spawned a self-help industry and built its advice on the principle of smiling and sincerity. But is it really selling a form of manipulation?
It's the second title in the series, Books That Changed Us which takes a fresh look at five influential books of the 20th century.
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