C. vom Berg, Geschichte der Familie Buchholz, Düsseldorf 1920, Teil I, S. 23
C. Pick, Familienbuch Lennep 1654-1809, Plaidt 2014, S. 1957, 2296
__ | __|__ | ___________________| __ | | | | |__|__ | Johann ÖLVERMANN | __ | (1634-1699)x1655 | | | | __|__ | | | | |___________________| __ | | | | |__|__ |--Christina ÖLVERMANN | (1678-1713)x1696 __ | | | __|__ | | | Peter HACKENBERG | __ | | (1604-1677)x1635 | | | | |__|__ | | | Christina HACKENBERG | __ (1635-1711)x1655 | | | __|__ | | | N. | __ x1635 | | |__|__