Some articles, and books from Geerhardus Vos and other websites that have some material on Vos from Monergism:

http://www.monergism.com/directory/search.php?action=search_links_simple&search_kind=and&phrase=Geerhardus+Vos&B1.x=-1013&B1.y=-178&B1=Search

Note that Vos’ writing is exegeticaly rigorous, so if you know Biblical Hebrew and Koine Greek it will be very useful to understand his writings.