APA

Clarke H. I., . (1947). Principles and practice of social work. New York: D. Appleton-Century Co.

Chicago

Clarke Helen Isabel, . 1947. Principles and practice of social work. New York: D. Appleton-Century Co.

Harvard

Clarke H. I., . (1947). Principles and practice of social work. New York: D. Appleton-Century Co.

MLA

Clarke Helen Isabel, . Principles and practice of social work. New York: D. Appleton-Century Co. 1947.