155.9 Ökologische Psychologie
155.92 Einfluss der sozialen Umwelt
155.924 Geschwisterreihe—ökologische Psychologie, . . . 155.925 Freundschaft—psychologischer Einfluss, . . . 155.926 Arbeitskollegen—psychologischer Einfluss 155.927 Fremde—psychologischer Einfluss
Dewey Decimal Classification
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