"Masters of Advertising Copy" (edited by Justus George Frederick) is a course on the principles and practice of copywriting with parts of the course written by one of the greatest copywriters of all time... Claude C. Hopkins!

Other contributors include... H. Harry Thompson, Bruce Barton, J.K. Fraser, Ben Nash, Kenneth Goode and many other notables in the field of copywriting.

The Masters of Advertising Copy course is like having a Ph.D. in copywriting.