by sleightlycrazy » Apr 14th, '11, 20:38
I think Psychological Subtleties 3 had a section on mental effects over the phone. I don't know if it has the specific effect you're looking for, but being Banachek's book, I'm sure whatever is in it is quality.
Currently Reading "House of Mystery" (Abbott, Teller), Tarbell, Everything I can on busking