Cluster SQL 2012 on Windows 2008 R2

Hi

Presently, i have a cluster SQL 2012 on windows 2008 R2 (2 nodes), i need to add a new server in cluster.

My question, it's possible to add WINDOWS 2012 SERVER with SQL 2012?

(2 nodes with Windows 2008 R2, 1 node with Windows 2012 and all nodes with SQL 2012)

If yes, do you have alink thatconfirms this?

Thanks