APA

United States, . (1998). Sales product catalog. Washington, D.C: U.S. G.P.O.

Chicago

United States, . 1998. Sales product catalog. Washington, D.C: U.S. G.P.O.

Harvard

United States, . (1998). Sales product catalog. Washington, D.C: U.S. G.P.O.

MLA

United States, . Sales product catalog. Washington, D.C: U.S. G.P.O. 1998.