APA

Willey R. D. V., . (1957). Group procedures in guidance. New York: Harper.

Chicago

Willey Roy De Verl, . 1957. Group procedures in guidance. New York: Harper.

Harvard

Willey R. D. V., . (1957). Group procedures in guidance. New York: Harper.

MLA

Willey Roy De Verl, . Group procedures in guidance. New York: Harper. 1957.