United States Postal Service & United States Postal Service. International Postal Rates and Fees.
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Cita Chicago Style (17a ed.)
United States Postal Service 与 United States Postal Service. International Postal Rates and Fees.
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Cita MLA (9a ed.)
United States Postal Service 与 United States Postal Service. International Postal Rates and Fees.
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警告：这些引文格式不一定是100％准确.