Katharine Hepburn (1987). “The making of The African Queen, or, How I went to Africa with Bogart, Bacall, and Huston and almost lost my mind”, Alfred A. Knopf
Canada Month, June 1963. A later satirical version of this saying added to the end "Luckily, this is not difficult" (Paul Dickson, The Official Rules [1978]). See Eleanor Roosevelt 2