Stafford, W. Father's voice: William Stafford. The Midwest.(1979).
Lua i Stíl Chicago (17ú heag.)Stafford, William. "Father's Voice: William Stafford." The Midwest.(1979) .
Lua MLA (8ú heag.)Stafford, William. "Father's Voice: William Stafford." The Midwest.(1979), .
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