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2
-
How sampling works / Richard Maisel, Caroline Hodges Persell.
- 001.422 M231
- Maisel, Richard,
- Pine Forge Press,
- [1996] ©1996
- Thousand Oaks, Calif. :
-
Designing surveys : a guide to decisions and procedures / Ronald Czaja, Johnny Blair.
- 001.422 C9981
- Czaja, Ronald,
- Pine Forge Press,
- [1996] ©1996
- Thousand Oaks, Calif. :