The following sources may of interest:
- The man page for Ghostscript ("
man gs").
- PostScript Language Reference Manual, Second Edition
published by Addison-Wesley (ISBN: 0-201-18127-4).
- The Joy of Coffee by Corby Kummer, published by
Chapters Publishing Ltd. (ISBN: 1-881527-53-0).
- PostScript Language Document Structuring Conventions Specification,
available from the Adobe FTP site as
5001.DSC_Spec.ps.
- PostScript Language Program Design published by
Addison-Wesley (ISBN: 0-201-14396-8).