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  Math Through the Ages: A Gentle History for Teachers and Others - William P. Berlinghoff, Fernando Q. Gouvêa - Google Books

  http://books.google.de/books?id=JAXNVaPt7uQC&pg=PA134

  Where did maths come from? Who thought up all those algebra symbols, and why? What's the story behind ... negative numbers? ... the metric system? ... quadratic equations? ... sine and cosine? The 25 independent sketches in Math through the Ages answer…

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  Sotho — Institut für Asien- und Afrikawissenschaften

  https://www.iaaw.hu-berlin.de/de/region/afrika/studium/sprachen/copy_of_sotho

  Keine Beschreibung vorhanden.

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  Judith Torney-Purta, Carolyn Barber: Democratic School Engagement and Civic Participation among European Adolescents (Special Edition 2005)

  http://wayback.archive.org/web/20070721214711/http://www.sowi-onlinejournal.de/2005-se/torney_purta_barber_iea_analysis.htm#3

  Beitrag 'Democratic School Engagement andCivic Participation among European Adolescents: Analysis of Data from the IEA Civic Education Study' from Judith Torney-Purta and Carolyn Barber in the Journal of Social Science Education (JSSE) Special Edition 2005

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