| Sources |
- [S780] Robinson, Dierdre, Kaeling, BIrkel, Kellar, Morrissey, Anderson, Butler, Woodward, Rutter, Mayberry---MD, NJ (Sources "Mareen Duvall of Middle Plantation" by Harry Wright Newman, c.1952, reprinted 2000 by Carl P. Brown, Pittsfield, MA).
- [S1322] Hammers, Marian G. Duvall, Some Descendants of Mareen Duvall, The Emigrant, and Allied Names, Cooper, Elliott, Fairlie, Blount, Yates and Piedfort Madisonville, KY, c1984 (quotes "Maryland Heraldic Families 1634/1635").
- [S1330] Barkman, Joanna E. Duvall, The Descendants of Dr. Jeremiah DuVALL and his Wife Sarah Penn (News Printing, c.1984).
- [S286] Ancestry.com, Web: Netherlands, GenealogieOnline Trees Index, 1000-2015, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2014;).
https://www.genealogieonline.nl/en/stamboom-dullemen/I244025.php
- [S1329] Ancestry of Barack Obama (http://www.wargs.com/political/obama.html).
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