Welch, Paul Smith, author
Limnological methods
McGraw-Hill, 1948
 Buku Teks
Historical Methods
Helen Dwight Reid Educational Foundation, {s.a}
 Majalah, Jurnal, Buletin
Morison, Murray
Methods in sociology
Longman, 1993
 Buku Teks
Snedecor, George W., author
Statistical methods
The Iowa State University Press, 1982
 Buku Teks
Methods in biotechnology
Taylor and Francis, 1997
 Buku Teks
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