APA

Calkins R., . (1924). The Christian church in the modern world. New York: Macmillan.

Chicago

Calkins Raymond, . 1924. The Christian church in the modern world. New York: Macmillan.

Harvard

Calkins R., . (1924). The Christian church in the modern world. New York: Macmillan.

MLA

Calkins Raymond, . The Christian church in the modern world. New York: Macmillan. 1924.