Speaking from a System Admin point of view I always had the IT agreement as an integral part of the Job acceptance - so if you didn't sign it you didn't get the job. Even the MD and the board were subject to restrictions, for their own protection, and it stopped any complaints from lower echelons. Good old days
You should find a fair number of Microsoft White-papers on the technet site, that should be official enough. they are actually more likely to be found in the server sections rather than the workstations.