APA

Gibbard M., . (1974). Twentieth-century men of prayer. London: SCM Press.

Chicago

Gibbard Mark, . 1974. Twentieth-century men of prayer. London: SCM Press.

Harvard

Gibbard M., . (1974). Twentieth-century men of prayer. London: SCM Press.

MLA

Gibbard Mark, . Twentieth-century men of prayer. London: SCM Press. 1974.