APA (7th ed.) Citation

Origen & Crombie, F. (1910). The writings of Origen. Clark.

Chicago Style (17th ed.) Citation

Origen and Frederick Crombie. The Writings of Origen. Edinburgh: Clark, 1910.

MLA (9th ed.) Citation

Origen and Frederick Crombie. The Writings of Origen. Clark, 1910.

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