"Belgique, Anvers, registres d’état civil, 1588-1913," database with images, FamilySearch (
https://familysearch.org/ark:/61903/1:1:XXXH-NFX : 12 August 2019), Corneel Langenus in entry for Ernest Jacob Alfred Langenus, 25 Jan 1881; citing Birth, Mechelen, Antwerpen, Belgium, België Staatsarchief (Belgium State Archives), Brussels; FHL microfilm 1,979,701.