APA

United States, . (1991). Inactive or discontinued items from the 1950 revision of the classified list. Washington: Superintendent of Documents).

Chicago

United States, . 1991. Inactive or discontinued items from the 1950 revision of the classified list. Washington: Superintendent of Documents).

Harvard

United States, . (1991). Inactive or discontinued items from the 1950 revision of the classified list. Washington: Superintendent of Documents).

MLA

United States, . Inactive or discontinued items from the 1950 revision of the classified list. Washington: Superintendent of Documents). 1991.