Numerical methods...
 Buku Teks
Welch, Paul Smith, author
Limnological methods
McGraw-Hill, 1948
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Historical Methods
Helen Dwight Reid Educational Foundation, {s.a}
 Majalah, Jurnal, Buletin
Morison, Murray
Methods in sociology
Longman, 1993
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Snedecor, George W., author
Statistical methods
The Iowa State University Press, 1982
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