APA

Mast T., . (1975). Study of the national standards for directional and other official signs. Washington DC: U.S. Department of Transportation. FHWA. Office of Research.

Chicago

Mast TM, . 1975. Study of the national standards for directional and other official signs. Washington DC: U.S. Department of Transportation. FHWA. Office of Research.

Harvard

Mast T., . (1975). Study of the national standards for directional and other official signs. Washington DC: U.S. Department of Transportation. FHWA. Office of Research.

MLA

Mast TM, . Study of the national standards for directional and other official signs. Washington DC: U.S. Department of Transportation. FHWA. Office of Research. 1975.