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1ā- Gravetter, Frederick J.Ngā marau “...Psychology Statistical methods....”
I whakaputaina 1988
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2ā- Gravetter, Frederick J.Ngā marau “...Psychology Statistical methods....”
I whakaputaina 2004
Pukapuka -
3ā- Gravetter, Frederick J.Ngā marau “...Psychology Statistical methods....”
I whakaputaina 2009
Pukapuka