APA

Knoblauch R. L., Pietrucha M. T., . (1987). Motorists' comprehension of regulatory, warning, and symbol signs. Volume II. Washington DC: U.S. Department of Transportation.

Chicago

Knoblauch Richard L, Pietrucha Martin T, . 1987. Motorists' comprehension of regulatory, warning, and symbol signs. Volume II. Washington DC: U.S. Department of Transportation.

Harvard

Knoblauch R. L., Pietrucha M. T., . (1987). Motorists' comprehension of regulatory, warning, and symbol signs. Volume II. Washington DC: U.S. Department of Transportation.

MLA

Knoblauch Richard L, Pietrucha Martin T, . Motorists' comprehension of regulatory, warning, and symbol signs. Volume II. Washington DC: U.S. Department of Transportation. 1987.