Avila, Dorcas M. Essentials of English : study and thinking skills Dorcas M. Avila - Valenzuela City : Mutya Publishing House, c2003. - 280 p. ; 25 cm. ISBN: 971-821-049-0. Subjects--Topical Terms: 1. English language-Study and teaching.. Dewey Class. No.: Fil. 420.7 Av958e 2003