Milbourne Christopher『Mediums, Mystics & The Occult』( T.Y. Crowell Co) Tom Interval「Houdini in The New York Times, Tells of “Spirit” Note by Houdini’s Mother」『THE NEW YORK TIMES』February 11, 1928. Page 2, Column 7（http://www.houdinimuseum.org/articles/1928_02.11.html） Massimo Polidoro「The Day Houdin...