"South Africa, Dutch Reformed Church Registers (Cape Town Archives), 1660-1970 ," database with images, FamilySearch (
https://familysearch.org/ark:/61903/1:1:XKHQ-ZZT : 8 November 2017), Adolf Henri Koster in entry for Adolf Frederik Koster, 14 Feb 1869, Baptism; citing p. , Cape Town, Cape of Good Hope, South Africa, State Archives, Cape Province; FHL microfilm 2,214,111.