APA (7th ed.) Citation

Frend, W. H. C. (1976). Religion, popular and unpopular in the early Christian centuries.

Chicago Style (17th ed.) Citation

Frend, William Hugh Clifford. Religion, Popular and Unpopular in the Early Christian Centuries. 1976.

MLA (9th ed.) Citation

Frend, William Hugh Clifford. Religion, Popular and Unpopular in the Early Christian Centuries. 1976.

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