APA

Clark D., . (1967). Work and the human spirit. New York: Sheed and Ward.

Chicago

Clark Dennis, . 1967. Work and the human spirit. New York: Sheed and Ward.

Harvard

Clark D., . (1967). Work and the human spirit. New York: Sheed and Ward.

MLA

Clark Dennis, . Work and the human spirit. New York: Sheed and Ward. 1967.