Cita APA (7a ed.)
Orbis Books & Tosco, U. Postage Stamps: Modern History in the Mail.
Cita Chicago Style (17a ed.)
Orbis Books y Uberto Tosco. Postage Stamps: Modern History in the Mail.
Cita MLA (9a ed.)
Orbis Books y Uberto Tosco. Postage Stamps: Modern History in the Mail.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.