Although words in headings are normally presented in their natural word order, certain phrase headings are inverted in order to bring the keyword, usually a noun, into the initial position. In a manual catalog or a single-entry listing or display, this inverted form serves to bring together subject headings containing the same noun for the purpose of subject collocation. Currently, natural word order is preferred in topical subject headings. The inverted form is retained in certain categories of headings involving cultural subjects and in cases where large numbers of similar headings in the inverted form have already been established. Examples

7.2124 References

See also:

7.212 Phrase headings