APA
World Health Organization, Gramme & United Nations Environment Pro. (1992). Urban air pollution in megacities of the world. Oxford: Blackwell.
Chicago
World Health Organization, Gramme and United Nations Environment Pro. 1992. Urban air pollution in megacities of the world. Oxford: Blackwell.
Harvard
World Health Organization, Gramme and United Nations Environment Pro. (1992). Urban air pollution in megacities of the world. Oxford: Blackwell.
MLA
World Health Organization, Gramme and United Nations Environment Pro. Urban air pollution in megacities of the world. Oxford: Blackwell. 1992.
