http://es.wikipedia.org/wiki/Mady_Christians

Carta de una desconocida, D.L. 1997---carátula (Mady Christians (int.))

Internet movie database, 18-05-2004---(Mady Christians; b. 1892, Vienna (Austria), d. 1951, Norwalk, Connecticut (USA); b. name Marguerite Maria Christians; sometimes credited as Margarete Christians; actress)

Film Index International, 1997---(Mady Christians ; b. 1900, d. 1951 ; cast)