That is how it was done in the old version, in the new version (tiddlywiki 5) you just need to use double curly braces like this:
{{YourTiddler}}
or you can use <$transclude tiddler=YourTiddler/>.
There are a few reference sites around,
I have one, Tobias has a very extensive collection of resources on
his site, there is also a community search set up
here that lets you search through the topics of many of the reference sites people have made. The search site also has a good listing of some
available reference sites.