United Nations Conference on Environment and Development. (1992). Agenda 21: Program of action for sustainable development. United Nations.
Citação do estilo Chicago (17ª ed.)United Nations Conference on Environment and Development. Agenda 21: Program of Action for Sustainable Development. Nueva York: United Nations, 1992.
Citação MLA (9ª ed.)United Nations Conference on Environment and Development. Agenda 21: Program of Action for Sustainable Development. United Nations, 1992.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.