Raczynski, James, Joseph E. Shumacher, Jesse B. Milby, Max Micheal, Molly Engle, Maggie Lerner, and Tom Woolley (1993). Comparing two substance abuse treatments for the homeless, Alcoholism Treatment Quarterly, 10(3-4): 217-233. Available at https://www.tandfonline.com/doi/abs/10.1300/J020V10N03_17.