With the link node filter you can easily link to another node by entering:
This will output:
Before we get started go to http://drupal.org/project/link_node and download the module and place it in sites/all/modules.
Then enable at Administer >> Site building >> Modules.
Go to Administer >> Site configuration >> Input formats and click on configure. Scroll down to the Filters section and tick Link Node Filter and then click on Save configuration at the bottom of the page.
Once again click configure and then click on the Configure tab.
Scroll down to the Link Node codes.
If you are linking to a page node you want to specify the title eg: “[node:node_id,title=”val2″]” you must enter title to the Allowed parameters for page nodes.
To test it out go to any node and enter in “[node:node_id,title=”test page”]” in the body field and make sure the node_id is a page content type.
If you are having any problems please leave a comment.