Generally determine access points for an item from its chief source (or chief source substitute) and from statements appearing prominently (cf. 0.8).  When statements appearing in the chief source, or statements appearing prominently, are ambiguous or insufficient, use information appearing in the contents of the item or appearing outside the item for determining access points.  Note that for works entered under certain rules (e.g., 21.4A1), it does not matter where the information appears.

See also:

21.0.  Introductory Rules