APA
National Asphalt Pavement Association. Information series nr 60, . (1977). Annual costs of pavements. Riverdale, MD: National Asphalt Pavement Association. Information series nr 60.
Chicago
National Asphalt Pavement Association. Information series nr 60, . 1977. Annual costs of pavements. Riverdale, MD: National Asphalt Pavement Association. Information series nr 60.
Harvard
National Asphalt Pavement Association. Information series nr 60, . (1977). Annual costs of pavements. Riverdale, MD: National Asphalt Pavement Association. Information series nr 60.
MLA
National Asphalt Pavement Association. Information series nr 60, . Annual costs of pavements. Riverdale, MD: National Asphalt Pavement Association. Information series nr 60. 1977.