International Programme on Chemical Safety. (2004). Asphalt (Bitumen). World Health Organization.
Citazione stile Chigago Style (17a edizione)International Programme on Chemical Safety. Asphalt (Bitumen). Geneva: World Health Organization, 2004.
Citatione MLA (9a ed.)International Programme on Chemical Safety. Asphalt (Bitumen). World Health Organization, 2004.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.