National Research Council (U.S.). Committee on School Transportation Safety. (2002). The relative risks of school travel: A national perspective and guidance for local community risk assessment. Transportation Research Board.
Παραπομπή σε μορφή Chicago (17η εκδ.)National Research Council (U.S.). Committee on School Transportation Safety. The Relative Risks of School Travel: A National Perspective and Guidance for Local Community Risk Assessment. Washington, DC: Transportation Research Board, 2002.
Παραπομπή σε μορφή MLA (9th εκδ.)National Research Council (U.S.). Committee on School Transportation Safety. The Relative Risks of School Travel: A National Perspective and Guidance for Local Community Risk Assessment. Transportation Research Board, 2002.
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