The hope is that rigorous review standards will allow Campbell, like Cochrane, to become a trusted and authoritative source of information.

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But he said the watchdog's calculations were based on what he considered "the most authoritative source" of national statistics on the subject from the Treasury.

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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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IMDb, an Amazon company for 14 years, is the world's most popular and authoritative source for movie, TV and celebrity content, with more than 160 million monthly unique visitors worldwide.

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The aim of BNF (British National Formulary) for Children is to provide a practical, relevant and authoritative information source for all health professionals involved in the drug therapy of children.

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The authoritative Bureau of Census ( source) finds 48 million uninsured, not 53 million.

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