- JOSEPH BOLGAR Obituary and Online Memorial (2008) - Legacy.com
- Who is Irina Bolgar and what are her accusations agaisnt Telegram's Pavel Durov? - MSN
- Who is Irina Bolgar and what are her accusations agaisnt Telegram's Pavel Durov? - The Times of India
- Bolgar Jackson leaves Danone Ventures after eight years - - Global Corporate Venturing
- More than 10,000 people expected at Bolgar. Journey to the Past festival - Realnoe vremya