Cita APA (7th ed.)
Ingham, F. G. The proofs, essays, sample, specimen and test stamps of Mexico.
Cita Chicago (17th ed.)
Ingham, Frederick G. The Proofs, Essays, Sample, Specimen and Test Stamps of Mexico.
Cita MLA (9th ed.)
Ingham, Frederick G. The Proofs, Essays, Sample, Specimen and Test Stamps of Mexico.
Atenció: Aquestes cites poden no estar 100% correctes.