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Downey, Lynn (2007). "A Short History of Denim"(PDF). official Levi Strauss & Co. historian. Archived(PDF) from the original on August 9, 2014. Retrieved June 2, 2014.
"女生七嘴八舌嚷「解放」 老教授硬是不准入課堂". The Kung Sheung Daily News (in Chinese). May 27, 1977. Archived from the original on March 6, 2019. Retrieved February 25, 2019.
Klink, Thomas Michael, ed. (2022). "DROPTIMA vs. industrielle Standard-Verfahren". Droptima - The Ecological Washing Technology (in German). Salzgitter, Germany: Klink Textile Pflege-Dienste. Archived from the original on July 10, 2022. Retrieved July 10, 2022.
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Downey, Lynn (2007). "A Short History of Denim"(PDF). official Levi Strauss & Co. historian. Archived(PDF) from the original on August 9, 2014. Retrieved June 2, 2014.