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geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:831925
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www.interment.net/data/us/ne/cass/otterbein/otter.htm (22 Oct 2009)
Cemetery records of Otterbein Cemetery in Cass County, Nebraska
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nebraskagravestones.org/cemetery.php?cemID=151 (14 Jul 2012)
Research your Nebraska ancestors and family history by searching our online database of Nebraska gravestone photos. Locate Nebraska gravestone images of your descendants and discover your Nebraska roots.
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www.rootsweb.ancestry.com/~necass/cemtrs.htm
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www.rootsweb.ancestry.com/~nesgs/Ancestree/vol05/v05n01p22.htm#30
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www.findagrave.com/cgi-bin/fg.cgi?page=cr&CRid=101095
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files.usgwarchives.org/ne/cass/cemeteries/otterbe.txt (26 Apr 2008)