Trojan, Ondřej, 1959- (Autor Personal)

Želary, 2004: title frame (Ondřej Trojan)

Internet movie database, May 4, 2006 (Ondrej Trojan, b. 1959, producer, actor, writer, director)

ČSFD.cz WWW site, February 8, 2018: Ondřej Trojan biography 1 page (Ondřej Trojan; born 31 December 1959 in Prague; movie director, producer, and actor; founder of the production company Total HelpArt T.H.A.) https://www.csfd.cz/tvurce/3312-ondrej-trojan/