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  1. 1

    Research designs by Spector, Paul E.

    Published 1981
    Book

    Research designs
  2. 2

    Research designs by Spector, Paul E.

    Published 1981
    Book

    Research designs
  3. 3

    Research designs by Spector, Paul E.

    Published 1981
    Book

    Research designs
  4. 4

    Research designs by Spector, Paul E.

    Published 1981
    Book

    Research designs

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