Não informado. (2001). Bibliography. National Research Council, Transportation Research Board.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Bibliography. Washington: National Research Council, Transportation Research Board, 2001.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Bibliography. National Research Council, Transportation Research Board, 2001.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.