Bigham, E. (2013). Introduction to PSPP: <a> step by step guide. [s.n.].
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Citação norma Chicago
Bigham, Elizabeth. Introduction to PSPP: <a> Step by Step Guide. [S.l.]: [s.n.], 2013.
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Citação norma MLA
Bigham, Elizabeth. Introduction to PSPP: <a> Step by Step Guide. [s.n.], 2013.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.