International Tin Study Group. (1949). Statistical year book. s.n.
Chicagoスタイル(17版)引用形式International Tin Study Group. Statistical Year Book. [The Hague]: s.n, 1949.
MLA(9版)引用形式International Tin Study Group. Statistical Year Book. s.n, 1949.
警告: この引用は必ずしも正確ではありません.