@neilparker62 I will appreciate it, ...not yet gotten any reference... the reference am assuming will have letterhead physicsforums (an official one) ... other than that be blessed 
brother...
brother...Physics Forums
chwala
neilparker62
Hi again. I don't think there is anything like an "official" pf letterhead since it's just a website. But you can check with @Greg Bernhardt on that one.