Maps.com (Firm) & ebrary, Inc. (1999). Immigrants to the United States, 1890. Maps.com.
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Chicago Style (17th ed.) Citation
Maps.com (Firm) and Inc ebrary. Immigrants to the United States, 1890. [S.l.]: Maps.com, 1999.
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MLA引文
Maps.com (Firm) and Inc ebrary. Immigrants to the United States, 1890. Maps.com, 1999.
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警告：這些引文格式不一定是100％准確.