Discovering Statistics Using IBM SPSS S..., Field, Andy

A unique identifier assigned to books and other printed publications, typically consisting of 10 or 13 digits. It may include hyphens for readability but is treated as a string value. The ISBN uniquely identifies a specific edition of a title across the publishing industry.

The date on which the product was first made available to the public or released for sale. It is expressed as a calendar date in year‑month‑day format (YYYY-MM-DD). This attribute helps users identify the time period of the product’s availability and can be used for sorting, filtering, or determining relevance based on release era.

The name of the entity that publishes or distributes the product, such as a book, magazine, or other media item.