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Please help me to find a reference (book) for the following upper bound of Gamma function

For $x \geq 1$ $$ \Gamma(x)\leq x^{x-1}. $$

Thank you.

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up vote 1 down vote accepted

Does it have to be a book? Here is the original paper (Anderson and Qiu 1997).

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Was this result first found really as late as 1997? – lhf Dec 7 '12 at 10:46

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