APA (7e ed.) Bronvermelding
Tortell, P. (2020). Earth 2020: An insider's guide to a rapidly changing planet. Open Book Publishers.
Chicago (17e ed.) Bronvermelding
Tortell, Philippe. Earth 2020: An Insider's Guide to a Rapidly Changing Planet. Cambridge, England: Open Book Publishers, 2020.
MLA (9e ed.) Bronvermelding
Tortell, Philippe. Earth 2020: An Insider's Guide to a Rapidly Changing Planet. Open Book Publishers, 2020.
Let op: Deze citaties zijn niet altijd 100% accuraat.