Cita APA (7th ed.)
National Postal Museum & Gammons, T. The Early Days of the Postal Service.
Cita Chicago (17th ed.)
National Postal Museum i Tony Gammons. The Early Days of the Postal Service.
Cita MLA (9th ed.)
National Postal Museum i Tony Gammons. The Early Days of the Postal Service.
Atenció: Aquestes cites poden no estar 100% correctes.