APA aipamena

Griffiths,Brian. (1975). Invisible barriers to invisible trade. Mac Millan.

Chicago Style aipamena

Griffiths,Brian. Invisible Barriers to Invisible Trade. London: Mac Millan, 1975.

MLA aipamena

Griffiths,Brian. Invisible Barriers to Invisible Trade. Mac Millan, 1975.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.