9Louise S. Robbins. Censorship and the American Library: the American Library Association's Response to Threats to Inteneetual Free-dom, 1939 - 1969. ( Greenwood Press, Westport, Connecticut), 1996 : 12;12 -13.
10Judith F. Krug & James A. Harvey. "A History of the Library Bill of Rights" American Libraries, 1972( 1 ) : 80 -82.