Hartley, R.J.
Online searching: principles and practice
Bowker-Saur, 1990
Buku Teks
Hammersley, Martyn
Educational research, policymaking and practice
Paul Chapman Publishing, 2002
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Babbie, Earl R.
The practice of social research
Wadsworth, 2010
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Phillips, Don T.
Operations research: principles and practice
John Wiley & Sons, 1976
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Babbie, Earl R.
The practice of social research
Wodsworth, 1986
Buku Teks