| Nota de fuente |
El reto, 2015---créditos del DVD (co-direction of Alpine scenes by Luis Trenker)
WWW IMDB, 18-11-2015---(Luis Trenker; b. Alois Franz Trenker, October 4, 1892 in St. Ulrich, Tyrol, Austria-Hungary [now Ortisei, Italy]; d. April 13, 1990 (age 97) in Bolzano, Trentino-Alto Adige, Italy; actor, director, writer)
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