Crano, William D.
Principles and methods of social research
Lawrence Erlbaum Assossiate, 2002
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The recall method in social surveys
edited by Louis Moss and Harvey Goldstein
University of London Institute of Education, 1979
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Vaus, D.A. de
Surveys in social research
University College London Press, 1996
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Wunsch, Guillaume J.
Introduction to demographic analysis: principles and methods
Plenum Press, 1978
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Alston, Margaret
Research for social workers : an introduction to methods
Allen & Unwin, 1998
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