This is a field of the Media Form
. That form is included in topics that describe media, such as newspaper articles, video, pictures, TV clips, etc. that may be of interest.
If the Media type is a Book, then you should include the ISBN, the International Standard Book Number, which can be found on the copyright page of all modern books. If the book is a bit too old, it may have the Library of Congress number. Enter it as LOC:XXXXXXXX. This will allow instant linking for purchase of those books.
-- Raymond Lutz
- 05 Jul 2007