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Weinheim [u.a.]: Beltz, 1974
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Te Deum, 200824
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Te Deum, 200728
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Australasian Society for Computers in Learning in Tertiary Education, 1991
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Elsevier BV, 1981
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SAGE Publications, 1978
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American Psychological Association (APA), 1961
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SAGE Publications, 1961
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American Psychological Association (APA), 1960
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American Psychological Association (APA), 1960
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American Psychological Association (APA), 1960
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Ovid Technologies (Wolters Kluwer Health), 1959
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American Psychological Association (APA), 1956
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American Psychological Association (APA), 1954
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Memorial Institute for Infectious Diseases, 1916
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SAGE Publications, 1982
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American Educational Research Association (AERA), 1982
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SAGE Publications, 1993
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Informa UK Limited, 1982
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Elsevier BV, 1968