Why a duck? : visual and verbal gems from the Marx Brothers movies / Edited by Richard J. Anobile - London : Studio Vista, 1972. - 288 p. il ISBN: 0-289-70285-2 Subjects--Personal Names: Marx, GrouchoMarx, HarpoMarx, IrmãosMarx, Zeppo Subjects--Topical Terms: CINEMA Subjects--Geographic Terms: ESTADOS UNIDOS