APA

FP-79, . (1981). Standard specifications for construction of roads and bridges on federal highway projects 1979 (Revised June 1981). Washington DC: U.S. Department of Transportation. Federal Highway Administration.

Chicago

FP-79, . 1981. Standard specifications for construction of roads and bridges on federal highway projects 1979 (Revised June 1981). Washington DC: U.S. Department of Transportation. Federal Highway Administration.

Harvard

FP-79, . (1981). Standard specifications for construction of roads and bridges on federal highway projects 1979 (Revised June 1981). Washington DC: U.S. Department of Transportation. Federal Highway Administration.

MLA

FP-79, . Standard specifications for construction of roads and bridges on federal highway projects 1979 (Revised June 1981). Washington DC: U.S. Department of Transportation. Federal Highway Administration. 1981.