A practical guide to behavioral research :
Sommer, Robert.
A practical guide to behavioral research : tools and techniques / by Robert Sommer. - 4th ed. - New York : OUP, c1997. - 376 p.
Includes index.
0195104196
Social sciences --Research.
H 62 / .S724
A practical guide to behavioral research : tools and techniques / by Robert Sommer. - 4th ed. - New York : OUP, c1997. - 376 p.
Includes index.
0195104196
Social sciences --Research.
H 62 / .S724