Lua APA (7ú heag.)

Não informado. (1979). Working paper series. International Potato Center, Social Science Department.

Lua i Stíl Chicago (17ú heag.)

Não informado. Working Paper Series. Lima: International Potato Center, Social Science Department, 1979.

Lua MLA (8ú heag.)

Não informado. Working Paper Series. International Potato Center, Social Science Department, 1979.

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