Παραπομπή APA

(1969). National Cooperative Highway Research Program-Research Results Digest. Washington: National Research Council, Transportation Research Board.

Παραπομπή Chicago Style

National Cooperative Highway Research Program-Research Results Digest. Washington: National Research Council, Transportation Research Board, 1969.

Παραπομπή MLA

National Cooperative Highway Research Program-Research Results Digest. Washington: National Research Council, Transportation Research Board, 1969.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.