Link, A. S. What happened to the progressive movement in the 1920's?: Arthur S. Link. Twentieth-century america : recent interpretations.(1972).
Chicago-Zitierstil (17. Ausg.)Link, Arthur S. "What Happened to the Progressive Movement in the 1920's?: Arthur S. Link." Twentieth-century America : Recent Interpretations.(1972) .
MLA-Zitierstil (8. Ausg.)Link, Arthur S. "What Happened to the Progressive Movement in the 1920's?: Arthur S. Link." Twentieth-century America : Recent Interpretations.(1972), .
警告：這些引文格式不一定是100％准確.