APA

United States, . (1991). Index of articles (materials, parts, processes, and appliances) certified under the technical standard order system. [Washington, D.C: .

Chicago

United States, . 1991. Index of articles (materials, parts, processes, and appliances) certified under the technical standard order system. [Washington, D.C: .

Harvard

United States, . (1991). Index of articles (materials, parts, processes, and appliances) certified under the technical standard order system. [Washington, D.C: .

MLA

United States, . Index of articles (materials, parts, processes, and appliances) certified under the technical standard order system. [Washington, D.C: . 1991.