[1] John J. Reimer - Karen Morgenroth. Hang together or hang separately: the cooperative authority work component of NACO. «Cataloging and classification quarterly», 17 (1993), n. 3/4, p. 127-161. [2] Mark Watson. Top five reasons why library administrators should support participation in the program for cooperative cataloging. <http://www.loc.gov/catdir/pcc/topfive.html> [Jan. 2003]. [3] Lettera di Brian E. C. Schottlaender a John Byrum, 30 Oct. 1997. [4] PCC - Program for Cooperative Cataloging. <http://lcweb.loc.gov/catdir/pcc/> [Jan. 2003]. [5] Anthony R. D. Franks. International participation in the program for cooperative cataloging: present status. «International cataloguing and bibliographic control», 30, n. 2, p. 23-26. [6] Lettera di Sarah E. Thomas a John D. Byrum, Oct. 27, 1997.