APA

Weltbank, . (19). Environmentally sustainable development occasional paper series. Washington, D.C: The World Bank.

Chicago

Weltbank, . 19. Environmentally sustainable development occasional paper series. Washington, D.C: The World Bank.

Harvard

Weltbank, . (19). Environmentally sustainable development occasional paper series. Washington, D.C: The World Bank.

MLA

Weltbank, . Environmentally sustainable development occasional paper series. Washington, D.C: The World Bank. 19.