APA (7th ed.) Citation

Luther, M. (1990). The Smalcald articles. Project Gutenberg.

Chicago Style (17th ed.) Citation

Luther, Martin. The Smalcald Articles. Champaign, Ill: Project Gutenberg, 1990.

MLA (9th ed.) Citation

Luther, Martin. The Smalcald Articles. Project Gutenberg, 1990.

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