How are ISBNs allocated to multi-format/multi-volume works?
An ISBN must be allocated to the whole set of volumes of a multi-volume work; also, if the individual volumes of the set are sold separately, each volume must have its own ISBN. Even when each volume is not sold separately, the allocation of an ISBN to each volume is advisable. It facilitates the handling of returns (damaged volumes), and eliminates the possibility of confusion over specific publications. Each volume should list all ISBNs.
An ISBN must be allocated to the whole set of volumes of a multi-volume work; also, if the individual volumes of the set are sold separately, each volume must have its own ISBN. Even when each volume is not sold separately, the allocation of an ISBN to each volume is advisable. It facilitates the handling of returns (damaged volumes), and eliminates the possibility of confusion over specific publications. Each volume should list all ISBNs. Similar rules apply to kits (e.g. a CD-ROM with accompanying booklet). If any part is available separately, a separate ISBN must be allocated to each part, and to the kit as a whole.
