ITIL® is one such phenomenon that keeps on developing with time and it is still in its nascent stage. In such a situation ITIL® publications play a very important role as they mark the changes and recent developments as proper records.
Apart from this, ITIL® publications serve as an excellent source of knowledge and reference material. ITIL® publications constitute general material and editions that are very specific to practices. One interesting fact about these ITIL® publications is that almost all of them are written through experience and knowledge rather then theory. Hence, they are more practical in reading and are also a tool for ITIL® application.
OGC has the copyright for all the ITIL® publications. OGC has developed a series of Service Management books under particular discipline that are widely considered to be the standard books for ITIL® practices.