The format field
This field identifies the physical format or medium in which a particular item was issued or exists (to identify material based on the type or inherent nature of an individual item, see the type field).
The format field is composed of twelve categories:
Material may be classified in more than one category when the format is ambiguous (for example, if it is difficult to determine whether the publication is a book or a periodical) or when the publication exists in more than one of the format categories (for example, if a periodical is published online, as a website).
When a citation has been created for a missing primary item based on documentation of that item from secondary material in the ARC archive, the format field will reflect both the primary and secondary material. For example, when the ARC has a review of a recording of a musical setting of Ashbery's work rather than the recording itself, the citation will be categorized by format both as a periodical and as an audio recording. When the ARC has secondary documentation in addition to the primary item, the format field will reflect only the primary material, and secondary materials will be listed in the notes field. For example, when the ARC has both a recording and a review of the recording, the citation will be categorized by format as an audio recording only.
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