APA

United States, . (1980). Environmental protection issues in the 1980s. [Washington, D.C: .

Chicago

United States, . 1980. Environmental protection issues in the 1980s. [Washington, D.C: .

Harvard

United States, . (1980). Environmental protection issues in the 1980s. [Washington, D.C: .

MLA

United States, . Environmental protection issues in the 1980s. [Washington, D.C: . 1980.