APA (7th ed.) Citation

Luther, M., & Reu, J. M. (1996). A Treatise on Good Works. Project Gutenberg.

Chicago Style (17th ed.) Citation

Luther, Martin, and Johann Michael Reu. A Treatise on Good Works. Project Gutenberg, 1996.

MLA (9th ed.) Citation

Luther, Martin, and Johann Michael Reu. A Treatise on Good Works. Project Gutenberg, 1996.

Warning: These citations may not always be 100% accurate.