"Deutschland Heiraten, 1558-1929," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NZZ1-9PD : 11 February 2018), Joach. Langbein in entry for Johann Friederich Martin Gehl and Margaretha Maria Dorothea Langbein, 23 Oct 1833; citing Basse (Lühburg), Mecklenburg-Schwerin, Germany; FHL microfilm 68,983.