Steinbeck, J. (1939). The grapes of wrath. Chicago : J Q Ferguson.
Lua i Stíl Chicago (17ú heag.)Steinbeck, John. The Grapes of Wrath. Chicago : J Q Ferguson, 1939.
Lua MLA (9ú heag.)Steinbeck, John. The Grapes of Wrath. Chicago : J Q Ferguson, 1939.
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