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. 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.