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How was the PDF format created? Quora

PDF Association - The PDF Association is the industry association for software developers producing or processing PDF files.

Adobe PDF 101: Summary of PDF

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

PDF Standards....transitioning the PDF specification from a de facto standard to a de jure standard – Information about PDF/E and PDF/UA specification for accessible documents file format (archived by The Wayback Machine)

ISO 19005-1:2005 the PDF/A-1 ISO standard published by the International Organization for Standardization (chargeable)

PDF Reference and Adobe Extensions to the PDF Specification

Portable Document Format: An Introduction for Programmers – Introduction to PDF vs. PostScript and PDF internals (up to v1.3)

The Camelot Paper – the paper in which John Warnock outlined the project that created PDF

Everything you wanted to know about PDF but were afraid to ask  - recording of talk by Leonard Rosenthol (Adobe Systems) at TUG 2007

Convert pdf files to office files , images, txt.