As far as I’m aware, no PDF or EPUB reader allows readers to view multiple non-contiguous pages at a time. If you want to look at the part of the bibliography which corresponds to the chapter you’re reading, you’ll need to flip back and forth. LiquidText is the only mass-market exception I know of.
Among other things, this exacerbates Physical cut and paste is a parallel act involving informal intermediate states.
Related: Maintaining multiple reading positions is difficult when reading digitally