written, produced and directed by Neil Docherty ; senior producer, Julian Sher ; a Frontline production with the Canadian Broadcasting Corporation ; WGBH
Arte France, Wilton Films, Quark Productions présentent ; une film de Tania Rakhmanova ; écrit par Paul Mitchell et Tania Rakhmanova ; réalisation, Tania Rakhmanova
1895 Films a Tom Jennings production for National Geographic Channel International and PBS ; director, Tom Jennings ; producer & editor, David Tillman ; producer, Liza Maddrey
a Florentine Films production ; a film by Ken Burns ; written by Geoffrey C. Ward ; produced by Paul Barnes, Pam Tubridy Baucom, Ken Burns ; produced in association with WETA Washington, DC ; executive producer, Ken Burns