- Reference letter For Katen Bakhytbek From Director of LLP “Neo Asia” Ismailov R.B.
- Certificate Katen Bakhytbek From the head of the KNAUF centre Adiyanov S.A.
- Reference letter For Katen Bakhytbek From General Service Director LLP ”FitnessLink”, Rakhimbayev G.A. 10.09.2009
- Certificate Katen Bakhytbek
- Reference letter For Katen Bakhytbek From Regional Manager of “Etihad” branch in Kazakhstan, Svetenko O.A. 15.12.2010
- Reference letter For Katen Bakhytbek From Director of Sustainable Development of JSC “Kaspi Bank” Kucherov V 08.08.2010
- Certificate. Katen Bakhytbek. From Chairman of International Mathematics competition Prof.Dr. Hasan Senay
- Katen Bakhytbek. From Chairman of International Mathematics competition Prof.Dr. Hasan Senay
- Certificate. Katen Bakhytbek. From General director Kazakhstan-Japan Center for Human Development Tadashi Sato 21.04.2006