APA

Boylan M. E., . (1950). Difficulties in mental prayer. Dublin: M.H. Gill.

Chicago

Boylan M Eugéne, . 1950. Difficulties in mental prayer. Dublin: M.H. Gill.

Harvard

Boylan M. E., . (1950). Difficulties in mental prayer. Dublin: M.H. Gill.

MLA

Boylan M Eugéne, . Difficulties in mental prayer. Dublin: M.H. Gill. 1950.