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1. David Fowler , The factorial function: Stirling's formula, Math. Gaz. 84 (March 2000), pp. 42–50.
3. George E. Andrews , Richard Askey and Ranjam Roy , Special functions, Cambridge University Press (1999).
G. J. O. Jameson , A fresh look at Euler's limit formula for the gamma function, Math. Gaz.
98 (July 2014) pp. 235–242.
7. J. M. Patin , A very short proof of Stirling's formula, Amer. Math. Monthly 96 (1989) pp. 41–42.