sentences:  A keyword index allows the reader to generally find quotations by significant words in the quotations.As described in its introduction, "The Yale Book of Quotations" is characterized by its greater focus, relative to its nearest competitors, "Bartlett's Familiar Quotations" and "The Oxford Dictionary of Quotations", on modern American quotations, including those that do not have conventional literary sources.These include quotations from politicians, judges, journalists, sportscasters, athletes, screenwriters, songwriters, and anonymous sources.