United Nations Environment Programme & United Nations Environment Programme. GPA Coordination Office. (2006). Protecting coastal and marine environments from land-based activities: A guide for national action. United Nations Environment Programme (UNEP), Global Programme of Action for the Protection of the Marine Environment from Land-based Activities (GPA).
Παραπομπή σε μορφή Chicago (17η εκδ.)United Nations Environment Programme και United Nations Environment Programme. GPA Coordination Office. Protecting Coastal and Marine Environments from Land-based Activities: A Guide for National Action. The Hague: United Nations Environment Programme (UNEP), Global Programme of Action for the Protection of the Marine Environment from Land-based Activities (GPA), 2006.
Παραπομπή σε μορφή MLA (9th εκδ.)United Nations Environment Programme και United Nations Environment Programme. GPA Coordination Office. Protecting Coastal and Marine Environments from Land-based Activities: A Guide for National Action. United Nations Environment Programme (UNEP), Global Programme of Action for the Protection of the Marine Environment from Land-based Activities (GPA), 2006.