ISBNAn ISBN (International Standard Book Number) is a unique number assigned to each book. To search by ISBN, omit all hyphens between digits. Jump to top
ISSNAn ISSN (International Standard Serial Number) is an eight-digit code that identifies a particular serial. When searching by ISSN, you may either omit or include the hyphen. If you do not type the hyphen, you must replace it with a space. Jump to top
An OCLC Number is an accession number assigned by the OCLC system when a record is added to WorldCat. Some OCLC numbers include the prefix "ocm." Ignore this prefix and enter the number.
If an OCLC number is fewer than eight digits, add the appropriate number of zeros to the beginning of the number to create an eight-digit number. For example, the OCLC number 1565173 should be searched as 01565173.
In WorldCat, the OCLC number is labeled Accession No. Jump to top