APA (7th ed.) Citation

Wilberforce, B. (1890). An Easy Method of Mental Prayer. London.

Chicago Style (17th ed.) Citation

Wilberforce, Bertrand. An Easy Method of Mental Prayer. London, 1890.

MLA (8th ed.) Citation

Wilberforce, Bertrand. An Easy Method of Mental Prayer. London, 1890.

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