Cita APA (7th ed.)

United Nations Environment Programme & UNEP. Global Environment Outlook 4: Evironment for development. GEO-4: evironment for development.

Cita Chicago (17th ed.)

United Nations Environment Programme i UNEP. Global Environment Outlook 4: Evironment for Development. GEO-4: Evironment for Development. UNEP. EARTHSCAN.

Cita MLA (9th ed.)

United Nations Environment Programme i UNEP. Global Environment Outlook 4: Evironment for Development. GEO-4: Evironment for Development.