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              Harkness, J. (1998). Cross-cultural survey equivalence. Mannheim: ZUMA.
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              Harkness, J. A. (Ed.). 1998. Cross-Cultural Survey Equivalence. ZUMA-Nachrichten Spezial, Nr. 3. Mannheim: ZUMA.
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              Harkness, J. A. (Eds.). 1998. Cross-Cultural Survey Equivalence. Mannheim: ZUMA- Nachrichten Spezial, No.3.
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              Harkness, Janet A. (Hg.) (1998), Cross-Cultural Survey Equivalence, ZUMA-Nachrichten, Mannheim. Harris, Richard J./Mills, Edgar W. (1985), »Religion, Values and Attitudes Toward Abortion«, Jour- nal for the Scientific Study of Religion, Jg. 24, H. 2, S. 137-154.
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              Harkness, Janet A. (ed.) (1998) Cross-Cultural Survey Equivalence. ZUMA-Nachrichten Spezial (Sonderheft), Nr. 3. Mannheim.
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              Spezial Band 3 Cross-cultural survey equivalence. Mannheim: ZUMA, S. 129- 144.
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