@article {MATHEDUC.05986873,
author = {Levrie, Paul},
title = {Stirred, not shaken, by Stirling's formula.},
year = {2011},
journal = {Mathematics Magazine},
volume = {84},
number = {3},
issn = {0025-570X},
pages = {208-211},
publisher = {Mathematical Association of America (MAA), Washington, DC},
doi = {10.4169/math.mag.84.3.208},
abstract = {Summary: An elementary proof of Stirling's asymptotic formula for $n!$ is given. The proof uses the Wallis formula for $\pi $ and the trapezoidal rule for the calculation of a definite integral, with error estimate.},
msc2010 = {I35xx},
identifier = {2012c.00570},
}