McDowell, Ian
Measuring health: a guide to rating scales and questionnaires
Oxford University Press, 1996
 Buku Teks SO
McDowell, Ian
Measuring health : a guide to rating scales and questionnaires
Oxford University Press, 1987
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Gallup, George
A Guide To Public Opinion Polls
Princeton University press, 1948
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Berdie, Douglas
Questionnaires: design and use
Scarecrow Press, 1974
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Kofler, Michael
The definitive guide to MySQL
Apress, 2004
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