- twitter.com john_sipher
- en.wikipedia.org Jon Cypher
- kinopoisk.ru name/123522/
- kinokopilka.pro people/30741-dzhon-sayfer
- imdb.com name/nm0194230/
- rezka.ag person/57819-dzhon-sayfer/
- ru.kinorium.com name/147701/
- kinogo.biz actors/46563-dzhon-sayfer.html
- kinogo.uk actors/57000-dzhon-sayfer.html