Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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