APA (7th ed.) Zitazioa
Tyler, V. E. Focus on Forgeries: A Guide to Forgeries of Common Stamps.
Chicago Style (17th ed.) Zitazioa
Tyler, Varro E. Focus on Forgeries: A Guide to Forgeries of Common Stamps.
MLA (9th ed.) Zitazioa
Tyler, Varro E. Focus on Forgeries: A Guide to Forgeries of Common Stamps.
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