Few authors who manage to find an agent and then a publisher or, lacking that, the funds to self-publish, find book sales a source of income substantial enough to provide for a single person, let alone two.

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For programmers, the perfect book is a source of reference, that provides examples and acts as a stepping-stone that raises you to the next level.

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The most authoritative source for such information is a book which is available on Amazon called The Reliance of the Traveler, A Classic Manual of Islamic Sacred Law .

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If so, Mr Blom's book is unlikely to be bettered as a source.

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Another source of help: Publisher cch just put out a how-to book on the subject: Practical Guide to Cost Segregation, by Paul G.

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After the publication of the book, a drama scholar wrote to Mr. Unsworth asking for his source on the hand-signal system.

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Source code can also be distributed in text-based form like a PDF or scanable book which is what MIT did for Phil Zimmermann and later what 70 international volunteers did for the PGPi Scanning Project in 1997.

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Bizarrely, one of Dr Lomborg's critics in Scientific American criticises as an affectation the book's insistence on documenting every statistic and every quotation with a reference to a published source.

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