A series of articles titled Courtship and Marriage from the 1924 volume of The Lutheran Witness, the official publication of The Lutheran Church—Missouri Synod, by Rev. Hans Manthey Zorn.
Letters from Eunice: Letters of a Fatherly Friend to a Young Christian Mother, published by Concordia Publishing House in 1921 as a translation from the original German by Rev. Carl Manthey-Zorn. The full book may be read for free at https://archive.org/details/zorn-eunice.