Mathews, R. (1959). The trade cycle. J. Nisbet & Co. at C.U.P.
Lua i Stíl Chicago (17ú heag.)Mathews, R. The Trade Cycle. London: J. Nisbet & Co. at C.U.P, 1959.
Lua MLA (9ú heag.)Mathews, R. The Trade Cycle. J. Nisbet & Co. at C.U.P, 1959.
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