Cita APA (7th ed.)

Wiederkehr, P., & Gilbert, R. (2002). Policy instruments for achieving environmentally sustainable transport. OECD.

Cita Chicago (17th ed.)

Wiederkehr, Peter, i Richard Gilbert. Policy Instruments for Achieving Environmentally Sustainable Transport. Paris, France: OECD, 2002.

Cita MLA (9th ed.)

Wiederkehr, Peter, i Richard Gilbert. Policy Instruments for Achieving Environmentally Sustainable Transport. OECD, 2002.