Helleiner, K. F. (1973). Free trade and frustration: Anglo-Austrian negotiations, 1860-70. University of Toronto Press.
Lua i Stíl Chicago (17ú heag.)Helleiner, Karl F. Free Trade and Frustration: Anglo-Austrian Negotiations, 1860-70. [Toronto, Buffalo]: University of Toronto Press, 1973.
Lua MLA (8ú heag.)Helleiner, Karl F. Free Trade and Frustration: Anglo-Austrian Negotiations, 1860-70. University of Toronto Press, 1973.
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