International Tin Study Group. (1949). Statistical year book. s.n.
Chicago Style aipamenaInternational Tin Study Group. Statistical Year Book. [The Hague]: s.n, 1949.
MLA aipamenaInternational Tin Study Group. Statistical Year Book. s.n, 1949.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.