I have a similar question. In the work history I have mentioned my job experience with respect to NOC codes. I have all the necessary reference letters for it.
I did a paid part time internship and a paid Student job for which I don’t have the relevant letters. Should I include those in the work history since they were paid? The problem is that the job was pretty generic which is not part of any NOC code. I am guessing for that reason I should probably include it in personal history. Do we have to provide reference letter for the employment we put in the personal history?