Citazione Stile APA (7a Edizione)

Barr, H. (1966). Probation research: A survey of group work in the prbation service. H.M.S.O.

Citazione stile Chigago Style (17a edizione)

Barr, Hugh. Probation Research: A Survey of Group Work in the Prbation Service. London: H.M.S.O, 1966.

Citatione MLA (9a ed.)

Barr, Hugh. Probation Research: A Survey of Group Work in the Prbation Service. H.M.S.O, 1966.