Santos, G. (2004). Road pricing: Theory and evidence. Elsevier.
Lua i Stíl Chicago (17ú heag.)Santos, G. Road Pricing: Theory and Evidence. Elsevier, 2004.
Lua MLA (9ú heag.)Santos, G. Road Pricing: Theory and Evidence. Elsevier, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.