Andrew Davis; Garrett Nagle. (2017). Environmental Systems and Societies IB Diploma Study Revision Gui: Second edition (2nd.). Hodder Education.
Chicago-viite (17. p.)Andrew Davis; Garrett Nagle. Environmental Systems and Societies IB Diploma Study Revision Gui: Second Edition. 2nd. Hodder Education, 2017.
MLA-viite (9. p.)Andrew Davis; Garrett Nagle. Environmental Systems and Societies IB Diploma Study Revision Gui: Second Edition. 2nd. Hodder Education, 2017.
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