Ison, S., & Wall, S. (1993). Economics. longman ; Pitman publishing.
Lua i Stíl Chicago (17ú heag.)Ison, Stephen, agus Stuart Wall. Economics. London: longman ; Pitman publishing, 1993.
Lua MLA (8ú heag.)Ison, Stephen, agus Stuart Wall. Economics. longman ; Pitman publishing, 1993.
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