Dr. Pepper Company. [Eight-panel storyboard of Frosty Dog, Pup, and a dragon, pt. 2], artwork, [1956..1964]; (https://texashistory.unt.edu/ark:/67531/metadc1813493/m1/1/: accessed June 11, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .