Johannes and Anna were married in a religious ceremony on March 21st, 1921 in Frankfort.
Family Notes
South Africa, Free State Dutch Reformed Church Records, 1848-1956," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KSLT-WS7 : accessed 05 Nov 2012), Johannes Hendrik Maartens and Anna Maria Mouton, 1921.