APA (7th ed.) Citation

(2005). A Catechism of Christian Doctrine. Project Gutenberg.

Chicago Style (17th ed.) Citation

A Catechism of Christian Doctrine. Project Gutenberg, 2005.

MLA (9th ed.) Citation

A Catechism of Christian Doctrine. Project Gutenberg, 2005.

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