APA

United States, . (1990). 1990 Census of transportation: planning package. [Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off.].

Chicago

United States, . 1990. 1990 Census of transportation: planning package. [Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off.].

Harvard

United States, . (1990). 1990 Census of transportation: planning package. [Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off.].

MLA

United States, . 1990 Census of transportation: planning package. [Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off.]. 1990.