from: http://stackoverflow.com/questions/1507672/putting-citation-text-on-same-slide-with-latex-beamer

• If you use the biblatex package, you can insert a complete bibliographic entry with the \fullcite command.
• I have used the bibentry style for this (part of natbib), which just allows you to write \bibentry{key} which directly expands to the full bibliographic entry.