Cita APA (7a ed.)
United States Postal Service & United States Postal Service. International Postal Rates and Fees.
Cita Chicago Style (17a ed.)
United States Postal Service y United States Postal Service. International Postal Rates and Fees.
Cita MLA (9a ed.)
United States Postal Service y United States Postal Service. International Postal Rates and Fees.
Precaución: Estas citas no son 100% exactas.