APA

Claybourne A., Doherty G., Fearn L. & Treays R. (2003). Planet Earth. london: Usborne Publishing.

Chicago

Claybourne Anna, Doherty Gillian, Fearn Laura and Treays Rebecca. 2003. Planet Earth. london: Usborne Publishing.

Harvard

Claybourne A., Doherty G., Fearn L. and Treays R. (2003). Planet Earth. london: Usborne Publishing.

MLA

Claybourne Anna, Doherty Gillian, Fearn Laura and Treays Rebecca. Planet Earth. london: Usborne Publishing. 2003.