"Michigan, Births, 1867-1902," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/NQJY-PMJ : accessed 28 December 2014), Mathew Achterhof in entry for Wilhelmina Achterhof, 03 Jun 1885; citing item 2 p 278 rn 319, Grand Rapids, Kent, Michigan, Department of Vital Records, Lansing; FHL microfilm 2,320,839.