APA

Wagner D., Hofstetter D., . (1978). Speed advisory information for reduced visibility conditions. Salem, OR: Oregon State Department of Transportation. State Highway Division.

Chicago

Wagner DR, Hofstetter DK, . 1978. Speed advisory information for reduced visibility conditions. Salem, OR: Oregon State Department of Transportation. State Highway Division.

Harvard

Wagner D., Hofstetter D., . (1978). Speed advisory information for reduced visibility conditions. Salem, OR: Oregon State Department of Transportation. State Highway Division.

MLA

Wagner DR, Hofstetter DK, . Speed advisory information for reduced visibility conditions. Salem, OR: Oregon State Department of Transportation. State Highway Division. 1978.