HRB-AASHO Joint Committee on Maintenance and Operations Personnel & National Research Council (U.S.). Highway Research Board. Progress report of HRB-AASHO Joint Committee on Maintenance and Operations Personnel. Highway Research Board.
Citazione stile Chigago Style (17a edizione)HRB-AASHO Joint Committee on Maintenance and Operations Personnel e National Research Council (U.S.). Highway Research Board. Progress Report of HRB-AASHO Joint Committee on Maintenance and Operations Personnel. Washington, D.C: Highway Research Board.
Citatione MLA (9a ed.)HRB-AASHO Joint Committee on Maintenance and Operations Personnel e National Research Council (U.S.). Highway Research Board. Progress Report of HRB-AASHO Joint Committee on Maintenance and Operations Personnel. Highway Research Board.