Cita APA (7th ed.)
Hopwood, T., & Hillwood Harris, S. Double Danger. Heinemann.
Cita Chicago (17th ed.)
Hopwood, Tony, i Sue Hillwood Harris. Double Danger. Oxford, Inglaterra: Heinemann.
Cita MLA (9th ed.)
Hopwood, Tony, i Sue Hillwood Harris. Double Danger. Heinemann.
Atenció: Aquestes cites poden no estar 100% correctes.