1. Adobe Systems Incorporated, PostScript Language Reference Manual, Addison-Wesley, 1986
2. Adobe Systems Incorporated, PostScript Language Tutorial and Cookbook, Addison-Wesley, 1986
3. ISO Standards for Computer Graphics: The First Generation;Arnold,1990
4. CGM and CGI;Arnold,1988
5. Boeing Computer Services, Technical Office Protocol (TOP) Specification, Version 3.0 1988, Seattle, WA, USA