See Allo

edited by American Writing Corporation

The World Bank , 1996

Buku Teks

Belshaw, Horace, author

Food and Agriculture Organization of the United Nations, 1959

Buku Teks

Nurkse, Ragnar, 1907-1959, author

Oxford University Press, 1961

Buku Teks

Holt, Robert T., author

Feffer and Simons , 1966

Buku Teks

Arnold, H.J.P., author

Dufour Editions, 1966

Buku Teks

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