I have pretty much always used 3M permanent double sided tape
(something
like this although this price seems higher than what I pay at the local office store) for my paper hybrid projects. It's cheap, acid free, easy to get and holds paper to paper well.
But now that I am doing more adhering of ribbon to paper, or more 3-D paper projects, I have been finding that the 3M works well at the beginning but after about 4 months I go back to find that the pieces are starting to drift away from each other.
What do you use for a strong adhesive tape?