Cheryl Schatz

Suzanne McCarthy has some excellent material on kephale.  Suzanne is a Greek scholar and trained in several different languages.

http://powerscourt.blogspot.com/2008/01/grudem-and-kephale.html

http://powerscourt.blogspot.com/2008/01/kephale-in-literature.html

http://powerscourt.blogspot.com/2008/01/omitted-citations.html

http://powerscourt.blogspot.com/2008/01/grudem-and-glare.html

http://powerscourt.blogspot.com/2008/01/grudem-and-ptolemy.html

I think you will find some good help in these links.  If I have missed anything, Suzanne would be a good one to ask as she does the primary research herself checking out the original historic references.