United Nations Environment Programme, World Tourism Organization, & Foundation for Environmental Education in Europe. (1996). Awards for improving the coastal environment: The example of the blue flag. United Nations Publication.
Παραπομπή σε μορφή Chicago (17η εκδ.)United Nations Environment Programme, World Tourism Organization, και Foundation for Environmental Education in Europe. Awards for Improving the Coastal Environment: The Example of the Blue Flag. United Nations Publication, 1996.
Παραπομπή σε μορφή MLA (8th εκδ.)United Nations Environment Programme, et al. Awards for Improving the Coastal Environment: The Example of the Blue Flag. United Nations Publication, 1996.
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