APA

Roberts D. E., . (1959). Existentialism and religious belief. New York: Oxford University Press.

Chicago

Roberts David E, . 1959. Existentialism and religious belief. New York: Oxford University Press.

Harvard

Roberts D. E., . (1959). Existentialism and religious belief. New York: Oxford University Press.

MLA

Roberts David E, . Existentialism and religious belief. New York: Oxford University Press. 1959.