APA (7th ed.) Citation

National Cooperative Highway Research Program. Research results digest. Transportation Research Board, National Research Council.

Chicago Style (17th ed.) Citation

National Cooperative Highway Research Program. Research Results Digest. [Washington, D.C.]: Transportation Research Board, National Research Council.

MLA (9th ed.) Citation

National Cooperative Highway Research Program. Research Results Digest. Transportation Research Board, National Research Council.

Warning: These citations may not always be 100% accurate.