Thomas, S. E. (1921). The principles and arithmetic of foreign exchange. Macdonald & Evans.
Lua i Stíl Chicago (17ú heag.)Thomas, S. Evelyn. The Principles and Arithmetic of Foreign Exchange. London: Macdonald & Evans, 1921.
Lua MLA (8ú heag.)Thomas, S. Evelyn. The Principles and Arithmetic of Foreign Exchange. Macdonald & Evans, 1921.
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