https://kunstwerknippes.wordpress.com/kolga-tbilisi-photo-2015/urban-maze-bei-kolga-tbilisi-photo-2015/
http://kolga.ge/en/#/exhibitions/
http://fodar.dir.bg/
www.pilates-krefeld.de
www.die-kinderaerzte.de
http://www.startnext.de/in-transit/blog/?bid=9386
http://streetphotographerblog.wordpress.com/2014/05/09/feature-178-berta-katona/
http://weristjack.de/destart.htm
http://www.hbf-de.org/Berta-Katona
http://www.studiocherie.net/gallery/photo-contest/
http://hg.hu/cikkek/alkotok/16933-magyar-kreativ-kulfoldon-katona-berta
http://kolga.ge/en/#/exhibitions/
http://fodar.dir.bg/
www.pilates-krefeld.de
www.die-kinderaerzte.de
http://www.startnext.de/in-transit/blog/?bid=9386
http://streetphotographerblog.wordpress.com/2014/05/09/feature-178-berta-katona/
http://weristjack.de/destart.htm
http://www.hbf-de.org/Berta-Katona
http://www.studiocherie.net/gallery/photo-contest/
http://hg.hu/cikkek/alkotok/16933-magyar-kreativ-kulfoldon-katona-berta