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M. Ester, H. Kriegel, J. Sander, and X. Xu. Proc. of 2nd International Conference on Knowledge Discovery and Data Mining (KDD-96), page 226-231. (1996)
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M. Maechler, P. Rousseeuw, A. Struyf, and M. Hubert. (2005)Rousseeuw et al provided the S original which has been ported to R by Kurt Hornik and has since been enhanced by Martin Maechler: speed improvements, silhouette() functionality, bug fixes, etc. See the 'Changelog' file (in the package source).