H.L. von Beckerath, Stammbaum von Beckerath nebst Descendenz, Krefeld 1903, S. 43
R.M. Snethlage, Stammliste der Familie Engels aus Wülfrath, Aachen 1973, S. 28
http://www.sprague-database.org/genealogy/getperson.php?personID=I317508&tree=SpragueProject
__ | Johannes RAHR |__ | (1590-1647)x1625 Lambert RAHR | __ | (1633-1683)x1659 | | | | NEUSENBERG |__ | (....-1647)x1625 Hubert RAHR | __ | (1678-1746)x1704 | | | | ___________________|__ | | | | | Agnes PETERSKINDERS | __ | (1638-1683)x1659 | | | |___________________|__ |--Agnes RAHR | (1705-1754)x1731 __ | | | ___________________|__ | | | ______________________| __ | | | | | | |___________________|__ | | | Margaretha SCHMALE | __ (....-1713)x1704 | | | ___________________|__ | | |______________________| __ | | |___________________|__