Crossword clues for Reference book abbr. 5 letters:ENCYSSets of reference books: Abbr.ETSEQReference book abbr.ENCReference book: Abbr.ENCYReference book: Abbr.OEDMulti-volume reference book (abbr.)CYCReference book: Abbr.OEDReference book: Abbr.IBIDReference book abbr.OEDStandard reference book: Abbr.DICTReference book (abbr.)