Great investors: the Warren Buffet approach

Millions of words have been written about Warren Buffett's approach to investing, including books by his former daughter-in-law Mary, old colleague David Clark and fund manager Robert Hagstrom.

Buffett himself has never written a book, but his annual shareholder letters to investors in his Berkshire Hathaway group are essential reading, providing many insights into his approach, even if they don't amount to a step-by-step guide to identifying a Buffett stock.