APA (7th ed.) Citation

Não informado. (1968). Research Results Digest. National Cooperative Highway Research Program.

Chicago Style (17th ed.) Citation

Não informado. Research Results Digest. Washington: National Cooperative Highway Research Program, 1968.

MLA (8th ed.) Citation

Não informado. Research Results Digest. National Cooperative Highway Research Program, 1968.

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