Παραπομπή APA

(1997). Highway safety design and operations guide 1997. Washington: American Association of State Highway and Transportation Officials.

Παραπομπή Chicago Style

Highway Safety Design and Operations Guide 1997. Washington: American Association of State Highway and Transportation Officials, 1997.

Παραπομπή MLA

Highway Safety Design and Operations Guide 1997. Washington: American Association of State Highway and Transportation Officials, 1997.

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