United Nations Postal Administration. Postal Issues of the United Nations 1951-1986.
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Cita Chicago Style (17a ed.)
United Nations Postal Administration. Postal Issues of the United Nations 1951-1986.
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Cita MLA (9a ed.)
United Nations Postal Administration. Postal Issues of the United Nations 1951-1986.
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警告：這些引文格式不一定是100％准確.