APA
International Road Federation, . (1973). Roads - social, economic and financial aspects. Summaries of selected papers. Washington, DC: International Road Federation.
Chicago
International Road Federation, . 1973. Roads - social, economic and financial aspects. Summaries of selected papers. Washington, DC: International Road Federation.
Harvard
International Road Federation, . (1973). Roads - social, economic and financial aspects. Summaries of selected papers. Washington, DC: International Road Federation.
MLA
International Road Federation, . Roads - social, economic and financial aspects. Summaries of selected papers. Washington, DC: International Road Federation. 1973.