APA

Coyle G. L., . (1948). Group work with American youth: a guide to the practice of leadership. New York: Harper.

Chicago

Coyle Grace Longwell, . 1948. Group work with American youth: a guide to the practice of leadership. New York: Harper.

Harvard

Coyle G. L., . (1948). Group work with American youth: a guide to the practice of leadership. New York: Harper.

MLA

Coyle Grace Longwell, . Group work with American youth: a guide to the practice of leadership. New York: Harper. 1948.