[texhax] Beamer Bibliography question

[J. Douglas Faires]

I am stuck on the Bibliography part of Beamer (Section 10.6 of the 
Beamer Guide) when adding the icons like [book], and [text]
as items, changing from the default [article]. In particular, I cannot 
get the \insertbiblabel command to be recognized.

The advanced Beamer example that is shown as the first of the Examples 
listed on  http://latex-beamer.sourceforge.net/ .
shows what I want to accomplish. The first bib item has a book beside 
it, the second one an article. It is stated there that
the source code for all these examples are in the examples directory of 
the Beamer package. However, I cannot find them
in my downloaded copy.

Where can the source code for these examples be found?

Thanks,
Doug Faires