I am looking for a relatively simple book/paper that explains the basic Streamline Upwind Petrov Galerkin (SUPG) method for solving the incompressible unsteady Navier-Stokes equations. Most of the references I have managed to find online have been papers that more-or-less assume you already know the method well. I plan on actually implementing my own solver that uses this method, so references that provide detail on how to do this would be helpful.
Note: Preference given to references that are freely available online.