APA (7e ed.) Bronvermelding

Pearce, F. (2010). Earth then and now: Amazing images of our changing world (Rev. pbk. ed.). Firefly Books.

Chicago (17e ed.) Bronvermelding

Pearce, Fred. Earth Then and Now: Amazing Images of Our Changing World. Rev. pbk. ed. New York: Firefly Books, 2010.

MLA (9e ed.) Bronvermelding

Pearce, Fred. Earth Then and Now: Amazing Images of Our Changing World. Rev. pbk. ed. Firefly Books, 2010.