Hensher, D. A. (1977). Value of business travel time. Pergamon Press.
Chicago Style aipamenaHensher, David A. Value of Business Travel Time. Oxford: Pergamon Press, 1977.
MLA aipamenaHensher, David A. Value of Business Travel Time. Pergamon Press, 1977.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.