BRIEN , D. O. (1999). CADBURY BOURNVITA'S BOOK OF KNOWLEDGE 7.
Cita Chicago (17th ed.)BRIEN , DEREK O. CADBURY BOURNVITA'S BOOK OF KNOWLEDGE 7. 1999.
Cita MLA (9th ed.)BRIEN , DEREK O. CADBURY BOURNVITA'S BOOK OF KNOWLEDGE 7. 1999.
Atenció: Aquestes cites poden no estar 100% correctes.