APA (7th ed.) Citation

Barth, K. (1964). The Heidelberg catechism for today. John Knox Press.

Chicago Style (17th ed.) Citation

Barth, Karl. The Heidelberg Catechism for Today. Richmond: John Knox Press, 1964.

MLA (9th ed.) Citation

Barth, Karl. The Heidelberg Catechism for Today. John Knox Press, 1964.

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