APA

United States, . (1969). Certification & approval of import products. [Washington, D.C: .

Chicago

United States, . 1969. Certification & approval of import products. [Washington, D.C: .

Harvard

United States, . (1969). Certification & approval of import products. [Washington, D.C: .

MLA

United States, . Certification & approval of import products. [Washington, D.C: . 1969.