Blumer, H. 1., Hughes, E. C. 1., Lee, A. M. 1., Hollingshead, A. d. B. 1., Reuter, E. B. 1., Humphrey, N. D. 1., & Smith, S. (1951). New outline of the principles of sociology (2. edition revised 1951.). New York: Barnes & Noble, Inc..

Blumer, Herbert 1900-1987, Everett Cherrington 1897-1983 Hughes, Alfred McClung 1906- Lee, August de Belmont 1907-1980 Hollingshead, Edward Byron 1880-1946 Reuter, Norman Daymond 1911-1955 Humphrey, and Samuel Smith. New Outline of the Principles of Sociology. 2. edition revised 1951. New York: Barnes & Noble, Inc., 1951.

Blumer, Herbert 1900-1987, et al. New Outline of the Principles of Sociology. 2. edition revised 1951. New York: Barnes & Noble, Inc., 1951.