Sommer, Robert, author
A practical guide to behavioral research: tools and techniques
Oxford University Press, 2001
 Buku Teks
Leavitt, Fred, author
Research methods for behavioral scientists
C. Brown Publishers , 1991
 Buku Teks
Denscombe, Martyn, author
Research proposals: a practical guide
Open University Press, 2012
 Buku Teks
Sommer, Robert, author
Behavioral research: Tools and techniques
New York, 2002
 Buku Teks
Causal models in the social sciences/ Editor by: H.M. Blalock
Aldine publishing, 1974
 Buku Teks
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