A Practical Guide to Behavioral Research: Tools and Techniques
by Barbara Sommer,Robert Sommer
ISBN 13: 9780195142099
Format: Paperback (380 pages) Publisher: OUP USA Published: 20 Sep 2001 Other Format: Paperback
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by Robert Sommer,Barbara Sommer
ISBN 13: 9780195142082
Format: Illustrated (404 pages) Publisher: Oxford University Press Published: 01 Aug 2001