Cita APA (7th ed.)
Tyler, V. E. Focus on Forgeries: A Guide to Forgeries of Common Stamps.
Cita Chicago (17th ed.)
Tyler, Varro E. Focus on Forgeries: A Guide to Forgeries of Common Stamps.
Cita MLA (9th ed.)
Tyler, Varro E. Focus on Forgeries: A Guide to Forgeries of Common Stamps.
Atenció: Aquestes cites poden no estar 100% correctes.