Walker, Tricia Computer science / Tricia Walker. - New York : Prentice Hall, 1992. - 153 p. ; 24 cm. + 2 sound disc (4 3/4 in.) - English for Academic Purpose Series . ISBN: 013280199X Subjects--Topical Terms: English language--Study and teaching--Foreign speakers Dewey Class. No.: 001.6 / WAL