APA (7th ed.) Citation

Messenger, R. E. (2010). Christian Hymns of the First Three Centuries. Project Gutenberg.

Chicago Style (17th ed.) Citation

Messenger, Ruth Ellis. Christian Hymns of the First Three Centuries. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Messenger, Ruth Ellis. Christian Hymns of the First Three Centuries. Project Gutenberg, 2010.

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