Cita APA (7th ed.)

(1999). Sustainable cities: Environmental challenges in the 21st century. Asian Development Bank, Office of Environment and Social Development, Environment Division.

Cita Chicago (17th ed.)

Sustainable Cities: Environmental Challenges in the 21st Century. Manila: Asian Development Bank, Office of Environment and Social Development, Environment Division, 1999.

Cita MLA (9th ed.)

Sustainable Cities: Environmental Challenges in the 21st Century. Asian Development Bank, Office of Environment and Social Development, Environment Division, 1999.