National Association of Probation Officers (Great Britain). Probation. Sage Publications.
Style de citation Chicago (17e éd.)National Association of Probation Officers (Great Britain). Probation. Thousand Oaks, CA: Sage Publications.
Style de citation MLA (8e éd.)National Association of Probation Officers (Great Britain). Probation. Sage Publications.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.