Linked PDF and going back in OS X Preview When I click on a linked reference in a PDF it jumps to the bibliography at the end of the paper. 
Is there an easy way to jump back to the passage I just read?
Preview can do this, once you have followed a link Cmd-[  will take you "Back" to the page where the link was clicked. Additionally if you wish to follow the link again using your keyboard, the obvious shortcut for "Forward" is then Cmd-].

Both of these may be found under the "Go" menu in Preview.