a co-production of Tigress Productions Limited and Thirteen/WNET New York in association with British Broadcasting Corporation ; producer, Linda Bell ; director, David Allen
produced by Thirteen in association with WNET.org and National Geographic Channel ; executive producer, Fred Kaufman ; written and produced by Gianna Savoie
written and directed by Klaus Feichtenberger ; producers, Dieter Pochlatko, Nikolaus Wisiak ; a co-production of EPO-Film, ORF/Universum and Thirteen in association with BBC, NDR and WNET New York Public Media