How To Kill A Librarian

I Suggest Using Grenade's And The Attachment For The Duplet That Give's It Four Barrel's Instead Of The Normal Two. If You Use Both Of These Thing's It Should Be Pretty Easy To Kill A Librarian And Get The Heavy Reader Achievement And If You Really Want To You Could try And Kill All Of The Librarian That Are In The Library Though I Suspect That It Will Be Pretty Difficult To Do That