Referring to professors in a paper

[broean01]

This is sort of off-topic, but I couldn't find a better forum to ask in.

I'm writing a paper for my internship, and I need to refer to one of my professors for purposes of background information. I want to do this in a professional manner.

Should I say Professor Xxxx Xxxxxxx, Ph.D.? Should I leave out the Ph.D.?
Doctor Xxxx Xxxxxxx?

 

[hunt_mat]

In most papers, you you wish to reference Prof A. Smith, then it just Smith, A