I'd recommend the following: "TCL/TK in a Nutshell", by Paul Raines and Jeff Tranter, published by O'Reilly and Associates, Inc., 1999, 440 pages, including index, ISBN: 1-56592-433-9 "TCL/TK Pocket Reference", by Paul Raines, published by O'Reilly and Associates, Inc. 1998, 90 p...