(EN) Paul Cremean, Peckinpah's West vs. Mann's Metropolis, su Grover Watrous' Golden Egg, 23 maggio 2006.
«Drawing heavily from the work of Robert Ardrey, controversial sociologist and author of ‘African Genesis’ and ‘The Territorial Imperative,’ Peckinpah ascribed to the belief that man is by nature territorial, brutal and elementally animal.»
