Cita APA (7th ed.)
Orbis Books & Tosco, U. Postage Stamps: Modern History in the Mail.
Cita Chicago (17th ed.)
Orbis Books i Uberto Tosco. Postage Stamps: Modern History in the Mail.
Cita MLA (9th ed.)
Orbis Books i Uberto Tosco. Postage Stamps: Modern History in the Mail.
Atenció: Aquestes cites poden no estar 100% correctes.