BLYTON, E. (1999). PUZZLE FOR THE SECRET SEVEN: 10.
Cita Chicago (17th ed.)BLYTON, ENID. PUZZLE FOR THE SECRET SEVEN: 10. 1999.
Cita MLA (9th ed.)BLYTON, ENID. PUZZLE FOR THE SECRET SEVEN: 10. 1999.
Atenció: Aquestes cites poden no estar 100% correctes.