||Records of the Rev. Guilford S. Northrup, Minister of thegospel
||Northrup, Guilford Smith
||Clinton Co. Hist. Soc.
||St. Johns, Michigan
|Northrup, Guilford Smith. Records of the Rev. Guilford S. Northrup, Minister of thegospel. (St. Johns, Michigan: Clinton Co. Hist. Soc., c1982).|
Available at the Family History Library.