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PostScript Language Reference, third edition (PLR3), plus its Supplement, is the de facto defining work, known as "The Red Book" on account of its covers.  The first edition covered PostScript Level 1, the second edition covered a greatly expanded language known as PostScript Level 2, and includes documentation for Display PostScript as well. The third edition covers PostScript 3 (with this version, Adobe dropped "level" from the name) but no longer includes DPS.

PostScript Language Tutorial and Cookbook is the corresponding introductory text, known as "The Blue Book" on account of its covers.

PostScript language program design is "The Green Book".

Adobe: PostScript vs. PDF - Official introductory comparison of PS, EPS vs. PDF.

Adobe: The Type 1 Font Format  (PDF file).

A First Guide to PostScript

Mathematical Illustrations: A Manual of Geometry and PostScript — a book by Bill Casselman.

Thinking in PostScript - 1990 by Glenn Reid, Addison-Wesley — available online courtesy of the author. A thorough tutorial.