APA (7th ed.) Citation

Hultgren, T. (1948). American transportation in prosperity and depression. National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Hultgren, Thor. American Transportation in Prosperity and Depression. [New York]: National Bureau of Economic Research, 1948.

MLA (9th ed.) Citation

Hultgren, Thor. American Transportation in Prosperity and Depression. National Bureau of Economic Research, 1948.