"George J. Laurer". UPC: The Transformation of Retail. IBM. January 25, 2011. Archived from the original on April 3, 2012. Retrieved December 11, 2019.
"George J. Laurer". UPC: The Transformation of Retail. IBM. January 25, 2011. Archived from the original on April 3, 2012. Retrieved December 11, 2019.