Παραπομπή σε μορφή APA (7η εκδ.)
WWF (Germany, Federal Republic), WWF (Germany, Federal Republic), & WWF. European Policy Office (EPO). (1999). Nature conservation and sustainable development for Europe: A challenge for the German EU-Presidency. WWF (Germany, Federal Republic).
Παραπομπή σε μορφή Chicago (17η εκδ.)
WWF (Germany, Federal Republic), Federal Republic) WWF (Germany, και WWF. European Policy Office (EPO). Nature Conservation and Sustainable Development for Europe: A Challenge for the German EU-Presidency. WWF (Germany, Federal Republic), 1999.
Παραπομπή σε μορφή MLA (9th εκδ.)
WWF (Germany, Federal Republic), et al. Nature Conservation and Sustainable Development for Europe: A Challenge for the German EU-Presidency. WWF (Germany, Federal Republic), 1999.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.