Cita APA (7th ed.)
Sanabria. Sanabria Air Mail Catalogue: North America 1995.
Cita Chicago (17th ed.)
Sanabria. Sanabria Air Mail Catalogue: North America 1995.
Cita MLA (9th ed.)
Sanabria. Sanabria Air Mail Catalogue: North America 1995.
Atenció: Aquestes cites poden no estar 100% correctes.