Cita APA (7th ed.)

Enger, E., & Smith, B. (1995). Pollution and policy. McGraw-Hill.

Cita Chicago (17th ed.)

Enger, Eldon, i Bradley Smith. Pollution and Policy. Boston: McGraw-Hill, 1995.

Cita MLA (9th ed.)

Enger, Eldon, i Bradley Smith. Pollution and Policy. McGraw-Hill, 1995.