APA (7th ed.) Citation

Milner, J. (1909). The key of heaven, or a manual of prayer. Philadelphia.

Chicago Style (17th ed.) Citation

Milner, John. The Key of Heaven, or a Manual of Prayer. Philadelphia, 1909.

MLA (8th ed.) Citation

Milner, John. The Key of Heaven, or a Manual of Prayer. Philadelphia, 1909.

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