Cita APA (7a ed.)

Heal, G. (1997). Valuing our future: Cost benefit analysis and sustainability. PNUD.

Cita Chicago Style (17a ed.)

Heal, Geoffrey. Valuing Our Future: Cost Benefit Analysis and Sustainability. New York: PNUD, 1997.

Cita MLA (8a ed.)

Heal, Geoffrey. Valuing Our Future: Cost Benefit Analysis and Sustainability. PNUD, 1997.