Cita APA (7a ed.)

(1990). Environmental policies for cites in the 1990s. O.E.C.D.

Cita Chicago Style (17a ed.)

Environmental Policies for Cites in the 1990s. Paris: O.E.C.D, 1990.

Cita MLA (9a ed.)

Environmental Policies for Cites in the 1990s. O.E.C.D, 1990.