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G. J. O. Jameson , Euler, Ioachimescu and the trapezium rule, Math. Gaz.
96 (March 2012) pp. 136–142.
3. F. W. J. Olver , Asymptotics and special functions, Academic Press (1974).
5. David Fowler , The factorial function: Stirling's formula, Math. Gaz. 84 (March 2000) pp. 42–50.
G. J. O. Jameson , A simple proof of Stirling's formula for the gamma function, Math. Gaz.
99 (March 2015) pp. 68–74.