Concise AACR2: 22. CHANGES IN TITLES PROPER

22A. Definition

Except for multipart resources (see rule 22B) and integrating resources (see rule 22D), make a new catalogue entry for a work if its title changes (see rule 22C). A title proper has changed if:

any word other than an article (for example, the, a, le), a preposition (for example, to, de, of), or a conjunction (for example, and, but, aber) is added, deleted, or changed or
there is a change in the order of the first five words (six if the title begins with an article).

However do not make a new catalogue entry if the change is:

in the representation of a word or words (for example, ignore a change from Trout and salmon news to Trout & salmon news)
after the first five words (six if the first is an article) and does not change the meaning of the title (for example, ignore a change from "The journal of the antiquities of Bootle and surroundings" to The journal of the antiquities of Bootle and its environs)
the addition or deletion of the name of the issuing body at the end of the title (form example, ignore a change from The journal of the cuisine of provincial Indiana of the League of Hoosier Gourmets to The journal of the cuisine of provincial Indiana) or
the addition, deletion, or change of punctuation (for example, ignore a change from Boot, shoe, sandal news to Boot/shoe/sandal news.

22B. Monographs

If the title proper of a monograph in more than one physical part (for example, a multivolume book) changes from one part to another, use the title proper of the first part as the title proper of the whole monograph. Make a note (see rule 7B5) about the other title(s).

22C. Serials

If the title proper of a serial changes, make a separate main entry for each title. Link these entries with notes (see rule 7B7).

22D. Integrating resources

If the title proper of an integrating resource changes, replace the former title proper with the new title proper. Give the earlier title in a note (see rule 7B7)