The APA Style Guide (Section 6.29) states that if there is nonroutine information necessary for identification it can be provided in brackets immediately after the title and any parenthetical information. Examples that are given in the guide include:
Notation:
[Letter to the editor]
[Special issue]
[Special section]
[Monograph]
[Abstract]
[Audio podcast]
[Data file]
[Brochure]
[Motion picture]
[Lecture notes]
[CD]
[Computer software]
[Video webcast]
[Supplemental material]