The explanation of Luther's Small Catechism as published by Concordia Publishing House, St. Louis MO. Copyright 2017.
Available for purchase at CPH.org https://www.cph.org/p-32272-luthers-small-catechism-with-explanation-2017-edition.aspx
The original small and large catechisms by Martin Luther can also be found online at http://bookofconcord.org
