That isn't an article, that is the actual BOL entry for MERGE. It has examples (including one that is specifically for your solution). However, I STRONGLY recommend you download and install the local copy of BOL 2012. More/better, and you don't have delay of online access, etc.
Best,
Kevin G. Boles
SQL Server Consultant
SQL MVP 2007-2012
TheSQLGuru on googles mail service