• 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.

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