California Crimes And Accidents Associated With Hitchhiking. California Highway Patrol, Operational Analysis Section, Februar 1974, archiviert vom Original am 30. Juli 2014; abgerufen am 3. Mai 2013: „No independent information exists about hitchhikers who are not involved in crimes. Without such information, it is not possible to conclude whether or not hitchhikers are exposed to high danger. However, the results of this study do not show that hitchhikers are over-represented in crimes or accidents beyond their numbers.“
California Crimes And Accidents Associated With Hitchhiking. California Highway Patrol, Operational Analysis Section, Februar 1974, archiviert vom Original am 30. Juli 2014; abgerufen am 3. Mai 2013: „No independent information exists about hitchhikers who are not involved in crimes. Without such information, it is not possible to conclude whether or not hitchhikers are exposed to high danger. However, the results of this study do not show that hitchhikers are over-represented in crimes or accidents beyond their numbers.“
worldcat.org
Joachim Fiedler et al: Anhalterwesen und Anhaltergefahren: unter besonderer Berücksichtigung des "Kurztrampens". Bundeskriminalamt Wiesbaden, Wiesbaden, Deutschland 1989, OCLC21676123.
