Leavitt, Fred
Research methods for behavioral scientists
C. Brown Publishers , 1991
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Sommer, Robert
Behavioral research: Tools and techniques
New York, 2002
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Causal models in the social sciences
edited by H.M. Blalock
Aldine Publishing, 1974
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Agnew, Neil McK.
The science game: an introduction to research in the behavioral sciences
Prentice-Hall, 1982
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Dubin, Robert
Theory building
The Free Press, 1978
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