APA

Laubach F. C., . (1946). Prayer: the mightiest force in the world. New York: Fleming H. Revell Company.

Chicago

Laubach Frank Charles, . 1946. Prayer: the mightiest force in the world. New York: Fleming H. Revell Company.

Harvard

Laubach F. C., . (1946). Prayer: the mightiest force in the world. New York: Fleming H. Revell Company.

MLA

Laubach Frank Charles, . Prayer: the mightiest force in the world. New York: Fleming H. Revell Company. 1946.