David Kelly, Stark Beauty, Solitude, Squalor and Sulfur -- Trona Has It All, The Los Angeles Times, October 4, 2006, Accessed December 28, 2006.
David Kelly, Stark Beauty, Solitude, Squalor and Sulfur -- Trona Has It All, The Los Angeles Times, 4. října 2006, přístup: 28. prosince 2006.