Eidem, R., & Viotti, S. (1978). Economic systems. Martin Robertson.
Lua i Stíl Chicago (17ú heag.)Eidem, Rolf, agus Staffan Viotti. Economic Systems. Oxford: Martin Robertson, 1978.
Lua MLA (8ú heag.)Eidem, Rolf, agus Staffan Viotti. Economic Systems. Martin Robertson, 1978.
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