Langford, J. W. (2011). The gap is not a theory! Xlibris Corp..
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Citação norma Chicago
Langford, Jack W. The Gap Is Not a Theory! United States: Xlibris Corp., 2011.
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Citação norma MLA
Langford, Jack W. The Gap Is Not a Theory! Xlibris Corp., 2011.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.