Preparing lecture notes and references?
There are three different sorts of bibliographic entries in your situation, I think: suggestions for further reading (for the students), acknowledgement of your sources, and historical references. One should acknowledge one's sources, whether or not it "helps the students". I think it will help them in the larger sense of perhaps slightly better appreciating how human knowledge is advanced and organized. Including historical references helps people understand the timescale on which things happen.

Even with "well-known" relatively elementary results whose origins have faded into obscurity, you can note that you learned these things from various textbooks yourself... not that you came up with it all yourself, for example. You could tell the textbooks you studied from.

Even if that information is not "tested-on", I think it sets a good model for the students.