Não informado. (1966). World survey of current research and development on roads and road transport. International Road Federation.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. World Survey of Current Research and Development on Roads and Road Transport. Washington: International Road Federation, 1966.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. World Survey of Current Research and Development on Roads and Road Transport. International Road Federation, 1966.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.