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| Curriculum 2005 and History. | 58 |
| November 2012 | December 2012 | January 2013 | March 2013 | April 2013 | May 2013 | |
| Curriculum 2005 and History. | 6 | 6 | 7 | 2 | 17 | 9 |
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| Y&T_2006(0)_Siebörger.pdf | 39 |
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| United States of America | 27 |
| China | 14 |
| South Africa | 10 |
| Canada | 4 |
| Iran | 1 |
| Netherlands | 1 |
| Ukraine | 1 |
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| Beijing | 9 |
| Potchefstroom | 7 |
| Redwood City | 5 |
| Sayreville | 5 |
| Toronto | 4 |
| Seattle | 2 |
| Edenvale | 1 |
| Klerksdorp | 1 |
| Kwa-zulu | 1 |
| Redmond | 1 |