Mark Twain, William Dean Howells (1960). “Mark Twain-Howells letters: the correspondence of Samuel L. Clemens and William D. Howells, 1872-1910”, Belknap Press
"Time to Wake Up: Stop Blaming Poverty on the Poor". Essay by Barbara Ehrenreich, published in Maria Shriver "The Shriver Report: A Woman’s Nation Pushes Back from the Brink", shriverreport.org. January 13, 2014.