Parvin Atai Contrastive study of English and Persian question signals - Ann arbor Univ Microfilms 1964 - v,122p. cm. - University of Michigan , Linguistics (Department of-) , dissertation , 1964 . Standard No.: 50,698 Source: Textual Subjects--Topical Terms: LINGUISTICS Dewey Class. No.: P1110m164,366, K4 (PD)