OXFORD UNI. PRESS. OXFORD CHILDRENS ENCYCLOPEDIA 8.
Cita Chicago (17th ed.)OXFORD UNI. PRESS. OXFORD CHILDRENS ENCYCLOPEDIA 8.
Cita MLA (9th ed.)OXFORD UNI. PRESS. OXFORD CHILDRENS ENCYCLOPEDIA 8.
Atenció: Aquestes cites poden no estar 100% correctes.