APA (7th ed.) Citation

Luther, M. (1990). The large catechism. Christian Classics Ethereal Library.

Chicago Style (17th ed.) Citation

Luther, Martin. The Large Catechism. Grand Rapids, Mich.: Christian Classics Ethereal Library, 1990.

MLA (9th ed.) Citation

Luther, Martin. The Large Catechism. Christian Classics Ethereal Library, 1990.