APA (7th ed.) Zitazioa
Ingham, F. G. The proofs, essays, sample, specimen and test stamps of Mexico.
Chicago Style (17th ed.) Zitazioa
Ingham, Frederick G. The Proofs, Essays, Sample, Specimen and Test Stamps of Mexico.
MLA (9th ed.) Zitazioa
Ingham, Frederick G. The Proofs, Essays, Sample, Specimen and Test Stamps of Mexico.
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