APA

Vandervalk-Ostrander A., American Association of State Highway and Transportation Officials, United States & National Cooperative Highway Research Program. (2009). AASHTO guidelines for traffic data programs. Washington, D.C: American Association of State Highway and Transportation Officials.

Chicago

Vandervalk-Ostrander Anita, American Association of State Highway and Transportation Officials, United States and National Cooperative Highway Research Program. 2009. AASHTO guidelines for traffic data programs. Washington, D.C: American Association of State Highway and Transportation Officials.

Harvard

Vandervalk-Ostrander A., American Association of State Highway and Transportation Officials, United States and National Cooperative Highway Research Program. (2009). AASHTO guidelines for traffic data programs. Washington, D.C: American Association of State Highway and Transportation Officials.

MLA

Vandervalk-Ostrander Anita, American Association of State Highway and Transportation Officials, United States and National Cooperative Highway Research Program. AASHTO guidelines for traffic data programs. Washington, D.C: American Association of State Highway and Transportation Officials. 2009.