Fieandt, Kai von. The world of perception [electronic resource] / [by] Kai von Fieandt, an English adaptation, by the author, of his Havaitsemisen maailma, with the consultation of Michael Wertheimer.. — Homewood, Ill., : Dorsey Press,, 1966.. — ix, 418 p. : illus., 6 col. plates. 24 cm. - The Dorsey series in psychology.