APA (7th ed.) Citation

Küng, H. (1979). The Christian Challenge: A shortened version of On being a Christian. Doubleday Co.

Chicago Style (17th ed.) Citation

Küng, Hans. The Christian Challenge: A Shortened Version of On Being a Christian. Garden City, N.Y: Doubleday Co, 1979.

MLA (9th ed.) Citation

Küng, Hans. The Christian Challenge: A Shortened Version of On Being a Christian. Doubleday Co, 1979.

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