Alright, before I go out into the first hot day of the year, here is a worksheet on distinguishing use of the verbs allude and refer and thereby distinguishing between the acts of alluding and referring. Incidentally, allude is used only intransitively whereas refer is used both intransitively and transitively.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.