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SPSS Inc, 1990
Buku Teks
Ali Baroroh, author
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Buku Teks
Triton Prawira Budi, author
Andi , 2006
Buku Teks
Ton J. Cleophas
[Springer, ], 2012
eBooks
Hull, C. Hadlai, author
McGraw-Hill, 1981
Buku Teks