APA

National Board of Public Roads and Waterways, Research Office of Economic Division & Sarja B:3/1978. (1978). Summaries of the person traffic study reports. Helsingfors: National Board of Public Roads and Waterways.

Chicago

National Board of Public Roads and Waterways, Research Office of Economic Division and Sarja B:3/1978. 1978. Summaries of the person traffic study reports. Helsingfors: National Board of Public Roads and Waterways.

Harvard

National Board of Public Roads and Waterways, Research Office of Economic Division and Sarja B:3/1978. (1978). Summaries of the person traffic study reports. Helsingfors: National Board of Public Roads and Waterways.

MLA

National Board of Public Roads and Waterways, Research Office of Economic Division and Sarja B:3/1978. Summaries of the person traffic study reports. Helsingfors: National Board of Public Roads and Waterways. 1978.