Recommended reading, CD-i & VCD references, training materials, etc.

CD-i Designers Guide	A basic introductory text on CD-i.
Discovering CD-i	A good overall book covering CD-i, whose authors are very familiar with OS-9.
Introducing CD-i	These 3 books are part of a set which covers most aspects of CD-i development. They can also be purchased individually.
The CD-i Design Handbook
The CD-i Production Handbook
The Digital Video Maker's Guide	Overview of planning & production of multimedia products, including Video CD.
Using Professional OS-9	A general purpose reference on OS-9, the OS upon which CD-i's OS (CD-RTOS) is based.
Green Book	The official CD-i technical specification.
White Book	The official Video CD technical specification.