Crato, N (2010). Mr. Benford. In: Figuring It Out: Entertaining Encounters with Everyday Math, Springer-Verlag: Berlin, pp. 173-177.
This work cites the following items of the Benford Online Bibliography:
Feller, W (1971). An Introduction to Probability Theory and Its Applications. 2nd ed., J. Wiley (see p 63, vol 2).
Newcomb, S (1881). Note on the frequency of use of the different digits in natural numbers. American Journal of Mathematics 4(1), pp. 39-40. ISSN/ISBN:0002-9327. DOI:10.2307/2369148.