I'm studying maths, and I've found it beneficial to write my notes as if I were writing a textbook for someone else's self study - forces me to understand the material to some extent.
It's of course incredibly unlikely these notes could actually be made into a textbook, but hypothetically, if I decided in some distant future to attempt to publish a textbook on maths, what are the rules for referencing?
Is it acceptable to source material almost solely from other textbooks, and simply place in the references at the back the names of those text books, or...?
Exercises. If I borrow exercises from other textbooks which look challenging (not every exercise) then how required am I to reference the book I found the exercise in? Even if I do reference, is there any issue that could stem from using those exercises? I've seen Wilson's theorem used as an exercise for almost every abstract algebra book I've read.