ISBN

From BarbWiki

• for books
• 13 or 10 digits is OK
• example: 978-0-7637-3402-2 or 0-7637-3402-0
• Use 13-digit ISBNs, if available, as these are now standard as of January 1, 2007 and issued to new books.
• Use dashes if they are included, as they divide the number into meaningful parts; the placement of dashes varies between books.