Software Donation Campaign for Secondary Schools and State Universities, "153 Пг "Н. Рилски"". Archived from the original on 2012-06-04. Retrieved 2012-06-06.
zaednoschools.org
Software Donation Campaign for Secondary Schools and State Universities, "153 Пг "Н. Рилски"". Archived from the original on 2012-06-04. Retrieved 2012-06-06.