Παραπομπή σε μορφή APA (7η εκδ.)

Gugele, B., & Ritter, M. (2001). European Community and Member States greenhouse gas emission trends 1990-99. Office for Official Publications of the European Communities.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Gugele, Bernd, και Manfred Ritter. European Community and Member States Greenhouse Gas Emission Trends 1990-99. Luxembourg: Office for Official Publications of the European Communities, 2001.

Παραπομπή σε μορφή MLA (8th εκδ.)

Gugele, Bernd, και Manfred Ritter. European Community and Member States Greenhouse Gas Emission Trends 1990-99. Office for Official Publications of the European Communities, 2001.