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Title | Author(s) | ISBN | Year | | Hello! : English for the 6th grade [книга] | Petkova, Desislava Petkova (съавтор) | 978-954-01-3292-1 | 2017 |
| Hello! Easy grammar for the 7th grade [книга] | Petkova, Desislava Petkova (и др.) | 978-954-01-2706-4 | 2012 |
| Hello! Easy grammar for the 7th grade [книга] | Petkova, Desislava Petkova (и др.) | 978-954-01-3804-6 | 2018 |
| Hello! English for the 5th grade [книга] | Petkova, Desislava Petkova (съавтор) | 978-954-01-3167-2 | 2016 |
| Hello! English for the 7.th grade [книга] | Petkova, Desislava Petkova (и др.) | 978-954-01-2151-2 | 2008 |
| Hello! English for the 7th grade [книга] | Petkova, Desislava Petkova (и др.) | 978-954-01-3562-5 | 2018 |
| Hello! English for the 8.th grade [книга] | Petkova, Desislava Petkova (и др.) | 978-954-01-2337-0 | 2009 |
| Hello! English for the VIth grade [книга] | Petkova, Desislava Petkova (и др.) | 978-954-01-2027-0 | 2007 |
| Hello! English for the Vth grade [книга] | Petkova, Desislava Petkova (и др.) | 954-01-1850-6,978-954-01-1850-5 | 2006 |
| Hello!: Easy grammar for the 5th grade [книга] | Petkova, Desislava Petkova (и др.) | 978-954-01-3526-7 | 2017 |
| Hello!: English for the 6th grade [книга] | Petkova, Desislava Petkova (съавтор) | 978-954-01-3348-5 | 2017 |
| Teen Zone A1. Workbook [книга] | Petkova, Desislava Petkova (и др.) | 978-954-01-3675-2 | 2018 |
| Teen zone: CEF A2.2 [книга] | Petkova, Desislava Petkova (и др.) | 978-954-01-4071-1 | 2020 |
| Teen zone: CEF A1 [книга] | Petkova, Desislava Petkova (и др.) | 978-954-01-3337-9 | 2017 |
| Teen zone: CEF A2.1 [книга] | Petkova, Desislava Petkova (и др.) | 978-954-01-4070-4 | 2020 |
