Cita APA (7a ed.)

Boylan, E. (1965). Difficulties in mental prayer (15th impression.). Gill and Son.

Cita Chicago Style (17a ed.)

Boylan, Eugene. Difficulties in Mental Prayer. 15th impression. Dublin: Gill and Son, 1965.

Cita MLA (9a ed.)

Boylan, Eugene. Difficulties in Mental Prayer. 15th impression. Gill and Son, 1965.