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Introduction to causal analysis : exploring survey data by crosstabulation / Ottar Hellevik.
- 300.72 H4776
- Hellevik, Ottar,
- George Allen & Unwin,
- 1984. ©1984
- London ; Boston :
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Surveys in social research / D.A. de Vaus.
- 300.723 D4888
- De Vaus, D. A.,
- George Allen & Unwin,
- 1986. ©1986
- London :