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* Tobin, Nona and Sexton, Sam, 1972; Attitudes toward and the effects of physical variables on hitchhiking, unpublished masters thesis, California State University, San Jose.
* Viard, Sylvain, 1999; "Auto-stop. Approche géographique", Université de Paris, Nanterre.
* [http://bernd.wechner.info/Hitchhiking/Suite101/Article/?81 71 A Dearth of Research: Does anyone really know anything about hitch-hiking?]* [http://bernd.wechner.info/Hitchhiking/Suite101/Article/?7181 Experiments in Hitch-hiking: What works best?]
== See also ==
