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| 1. |
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History and Ecology
James C Malin, Robert P Swierenga
Häftad. University of Nebraska Press, USA, 1984.
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| 2. |
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The Forerunners
Robert P Swierenga
Häftad. Wayne State University Press, USA, 2018.
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| 3. |
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Dutch Emigrants to the United States, South Africa, South America, and Southeast Asia, 1835-1880
Robert P Swierenga
Inbunden. Scholarly Resources Inc.,U.S., USA, 1983.
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| 4. |
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Dutch Households in U.S. Population Censuses, 1850, 1860, 1870
Robert P Swierenga
Inbunden. Rowman & Littlefield, USA, 1997.
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