APA

NORTHEN HELEN, . (1995). Clinical social work: knowledge and skills. New York: Columbia University Press.

Chicago

NORTHEN HELEN, . 1995. Clinical social work: knowledge and skills. New York: Columbia University Press.

Harvard

NORTHEN HELEN, . (1995). Clinical social work: knowledge and skills. New York: Columbia University Press.

MLA

NORTHEN HELEN, . Clinical social work: knowledge and skills. New York: Columbia University Press. 1995.