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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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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?2012-12-07