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# [[https://archive.org/details/birthofatascader00trav/page/n5 https://archive.org/stream/birthofatascader00trav/birthofatascader00trav_djvu.txt] The Birth of Atascadero] by Marguerite A. Travis; 1960's

# * The Jeweler's Circular Weekly: October 23, 1918  WW1# * Jeweler's Circular and Horological Review 1905-1906* Hindsight Journal of Optometry History: July 2010: "James E. Littlefield, Author of Optometry - The Littlefield System of Eye and Nerve Measurements", by David A. Goss;