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Title | Author(s) | ISBN | Year | | Destination English [книга] | Tsvetkova, Nikolina Valentinova (и др.) | | 2022 |
| English for You for 10.th Grade [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | | 2011- |
| English for You for 9.th Grade [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | | 2010- |
| English for you for the 8. th grade [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | | 2009- |
| English in mind for Bulgaria [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | 978-954-344-366-6 | 2017 |
| English in mind for Bulgaria A1 [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | 978-954-344-360-4 | 2017 |
| English in mind for Bulgaria A2 [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | 978-954-344-365-9 | 2018 |
| English in mind for Bulgaria A2.1 [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | 978-954-344-363-5 | 2017 |
| Flash on English A1 for Bulgaria [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | 978-954-344-399-4 | 2017 |
| Flash on English for Bulgaria A2 [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | 978-954-344-402-1 | 2017 |
| Flash on English for Bulgaria B1. Pt. 2 [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | 978-954-344-462-5 | 2018 |
| Flash on English for Bulgaria B1.1 [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | 978-954-344-405-2 | 2017 |
| Freeway [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | 978-954-18-0554-1 | 2007 |
| Freeway 3 [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | 954-18-0431-4 | 2005 |
| Freeway за 3. клас [книга] | Tsvetkova, Nikolina Valentinova (съавтор) | 954-18-0381-4 | 2004 |
