Casciani, Dominic (9. 3. 2018). World at One. BBC Radio 4. Корисна информација се налази на: 21m47s. Приступљено 9. 3. 2018. „there was some erroneous reporting that there were 21 other people being treated, that is not true, there has only been these three casualties and they are all still in hospital”CS1 одржавање: Формат датума (веза)
„GRU Globetrotters 2: The Spies Who Loved Switzerland”. Bellingcat. 6. 7. 2019. Архивирано из оригинала 6. 7. 2019. г. „Mark Urban reports in the book, and confirmed to us that at the end of June or beginning of July 2017, Sergey Skripal had to cancel a previously-scheduled interview on the grounds that he had to travel to Switzerland to meet with the local intelligence services.”CS1 одржавање: Формат датума (веза)
„GRU Globetrotters 2: The Spies Who Loved Switzerland”. Bellingcat. 6. 7. 2019. Архивирано из оригинала 6. 7. 2019. г. „Mark Urban reports in the book, and confirmed to us that at the end of June or beginning of July 2017, Sergey Skripal had to cancel a previously-scheduled interview on the grounds that he had to travel to Switzerland to meet with the local intelligence services.”CS1 одржавање: Формат датума (веза)
