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* Franzoi, Stephen, 1985; “Personality Characteristics of the Cross Country Hitchhiker”, Adolescence 20, pp. 655-668.
* Grundstad, Robert, 1982; Anti-hitchhiking Laws, Legislative Research, Legislative Administration Committee, Salem Oregon.
* Pudinski, W., 1974; [http://bernd.wechner.info/Hitchhiking/CHP/ California Crimes and Accidents Associated with Hitch-hiking], California Highway Patrol, Operational Analysis Section.
* Rinvolucri, Mario, 1974; Hitch-hiking, self published, London.
* Schlebecker, John T., 1958; “An Informal History of Hitchhiking”, The Historian 20, pp.305-327
