The chosen reference type specifies which fields appear in the Reference window. For instance, an EndNote journal article reference includes the fields "Journal," "Volume," and "Issue," while a book reference includes fields such as "Publisher" and "City." The Reference window only displays the fields that are relevant to the chosen reference type.
It is best to select the reference type before entering the bibliographic information in a reference. However, you can change the reference type of a reference at any time using the Reference Type list at the top of the Reference window.
Styles, filters, and connection files can include templates for all of the different reference types. This enables various types of references to be formatted differently in a bibliography or imported differently, as necessary.
The reference types and fields available to you when editing a style, filter, or connection file depend on how the reference types are configured in the Reference Types preference. These files update automatically to reflect changes made in the Reference Types preference (such as changing the name of a field).