Oxford advanced learner´s dictionary of current english / A. S. Hornby ; edited by Sally Wehmeier ; phonetics editor Michael Ashby. — 6th ed. — Oxford : University Press, [2000]. — Obras de referencia. — XII, 1539 p. : il. ; 24 cm. — ISBN 0-19-431-510-X 1. Lengua inglesa.2. Diccionarios. I. Wehmeier, Sally, ed.. II. Ashby, Michael. 802.0(038)