APA

Perkins H. C., . (1974). Air pollution. New York: McGraw-Hill.

Chicago

Perkins Henry C, . 1974. Air pollution. New York: McGraw-Hill.

Harvard

Perkins H. C., . (1974). Air pollution. New York: McGraw-Hill.

MLA

Perkins Henry C, . Air pollution. New York: McGraw-Hill. 1974.