Campbell, B., & Humphrey, T. F. (1988). Methods of cost-effectiveness analysis for highway projects. Transportation Research Board, National Research Council.
Παραπομπή σε μορφή Chicago (17η εκδ.)Campbell, Bruce, και Thomas F. Humphrey. Methods of Cost-effectiveness Analysis for Highway Projects. Washington, D.C: Transportation Research Board, National Research Council, 1988.
Παραπομπή σε μορφή MLA (9th εκδ.)Campbell, Bruce, και Thomas F. Humphrey. Methods of Cost-effectiveness Analysis for Highway Projects. Transportation Research Board, National Research Council, 1988.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.