Boyle, D. K. (1998). Passenger counting technologies and procedures. National Academy Press.
Lua i Stíl Chicago (17ú heag.)Boyle, Daniel K. Passenger Counting Technologies and Procedures. Washington, D.C: National Academy Press, 1998.
Lua MLA (9ú heag.)Boyle, Daniel K. Passenger Counting Technologies and Procedures. National Academy Press, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.