Final answer:
To cite a play with more than one act, include the act, scene, and line number for verse plays, act and scene for prose plays, and just the act if there are no scenes.
Step-by-step explanation:
The proper way to cite plays that have more than one act depends on whether the play is written in verse or prose. For verse plays such as those written by Shakespeare, you should reference act, scene, and line number in your in-text citation, for example, (Hamlet 4.4.31-39).
However, for prose plays or those that do not have line numbers, you should provide a citation with the act and perhaps scene, like (2.3) for Act 2, Scene 3 or just the act if scenes are not available.
If you are citing multiple works by the same author in one reference, make sure to include the title of the play to avoid confusion.