Cita APA (7th ed.)

Hettige, H. (1995). IPPS: The industrial pollution projection system. Environment, Infrastructure, and Agricultural Division, Policy Research Department, The World Bank.

Cita Chicago (17th ed.)

Hettige, Hemamala. IPPS: The Industrial Pollution Projection System. Washington, D.C: Environment, Infrastructure, and Agricultural Division, Policy Research Department, The World Bank, 1995.

Cita MLA (9th ed.)

Hettige, Hemamala. IPPS: The Industrial Pollution Projection System. Environment, Infrastructure, and Agricultural Division, Policy Research Department, The World Bank, 1995.