The Grobbel Family History - from Germany to the USA
- Includes the stories of the Grobbel family origins in 14th Century Westphalia, the 7 Grobbels who emigrated to Michigan in the 18th Century and many of their descendants; also reports, pictures and links.
- http://www.familytreemaker.com/users/g/r/o/Michael-V-Grobbel/index.html

Boyer's Genealogy
- Boyers of Ohio and Michigan.
- http://www.ripleyshome.com