Trossarelli, L. (2010). "the history of nylon". Club Alpino Italiano, Centro Studi Materiali e Tecniche. Archived from the original on April 25, 2012. Retrieved February 28, 2012.
Trossarelli, L. (2010). "the history of nylon". Club Alpino Italiano, Centro Studi Materiali e Tecniche. Archived from the original on April 25, 2012. Retrieved February 28, 2012.