[O] Exporting org-mode source

[Vikas Rawal]

I want to export a block of org-mode source code in a tutorial I am writing. 

I have tried variations of the following. But nothing seems to give me org-mode 
code in the exported pdf.

#+BEGIN_SRC org :results code replace

org-mode code here

#+END_SRC

What is the right way to do it? 

Vikas