APA (7e ed.) Bronvermelding

Calder, N. (1973). Nature in the round: A guide to environmental science. Viking Press.

Chicago (17e ed.) Bronvermelding

Calder, Nigel. Nature in the Round: A Guide to Environmental Science. New York: Viking Press, 1973.

MLA (9e ed.) Bronvermelding

Calder, Nigel. Nature in the Round: A Guide to Environmental Science. Viking Press, 1973.