GILL, R. T. (1973). Economic Development Past And Present Richard T. Gill. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)GILL, Richard T. Economic Development Past And Present Richard T. Gill. Prentice-Hall, 1973.
Lua MLA (8ú heag.)GILL, Richard T. Economic Development Past And Present Richard T. Gill. Prentice-Hall, 1973.
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