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References for ZipfDistribution and References in help pages in general

Hello everyone,

I am going to use ZipfDistribution[Rho] function for doing some
statistical calculations but its implementation has confused me and
there is no references for it.

In its definition they write:

The probability for value x and finite n is given by x^-(\[Rho]+1)/
Subsuperscript[H, n, (\[Rho]+1)] and for infinite n given by x^-(\[Rho]

The definition of the infinite case is different from what one usually
finds in technical papers and the internet, e.g. at wikipedia .

For infinite case, the exponent is 1+Rho in the Mathematica definition
while for other papers there is no 1 .

Unfortunately Wolfram team hasn't provided any references for its
implementation and I am confused by it.

Does someone has any suggestions regarding this problem, or does
someone knows a reference to clarify the inconsistency of definitions?

Generally this is a big problem by the help system of the Mathematica.
For another system one often finds a Reference section at the end of help
pages which  allows users to see the definition and the algorithms
used in the implementation. This is unfortunately not true with the
Mathematica which is very a powerful system.

Thank you in advance,

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