Bernstein, B. J., & Matusow, A. J. (1972). Twentieth-century america: Recent interpretations (2. ed.). Harcourt Brace Jovanovich.
Lua i Stíl Chicago (17ú heag.)Bernstein, Barton J., agus Allen J. Matusow. Twentieth-century America: Recent Interpretations. 2. ed. New York [u.a.]: Harcourt Brace Jovanovich, 1972.
Lua MLA (8ú heag.)Bernstein, Barton J., agus Allen J. Matusow. Twentieth-century America: Recent Interpretations. 2. ed. Harcourt Brace Jovanovich, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.