(1968). Services for British exporters. London: H.M. Stationery Off.
Chicago Style aipamenaServices for British Exporters. London: H.M. Stationery Off, 1968.
MLA aipamenaServices for British Exporters. London: H.M. Stationery Off, 1968.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.