Não informado. (1946). Instrument practice. United Trade Press.
Chicagoスタイル(17版)引用形式Não informado. Instrument Practice. London: United Trade Press, 1946.
MLA(8版)引用形式Não informado. Instrument Practice. United Trade Press, 1946.
警告: この引用は必ずしも正確ではありません.