A record of a subject heading that shows its established form, cites the authorities consulted in determining the choice and form of the heading, and indicates the cross references made to and from the heading.
A collection of subject authority records is known as subject authority file.
Free floating subdivisions under specific types of headings
Ex . Actors—Political activity
Free floating subdivisions indicated by “multiples”
Ex . Birth control—Religious aspects—Buddhism [Christianity, etc.]
Free floating subdivisions controlled by pattern headings
Examples of Pattern Headings Shakespeare, William, 1564-1616. Hamlet Literary works entered under author Shakespeare, William, 1564-1616 Individual literary authors English language --Pronoun Languages and groups of languages