Gapper, Sherry E.2012-11-092012-11-0919842012-11-09http://hdl.handle.net/11056/2040application/pdfes-ESReconocimiento-NoComercial-SinObraDerivada 3.0 Costa Ricahttps://creativecommons.org/licenses/by-nc-nd/3.0/cr/LITERATURAFONÉTICAINGLESCOLECCIÓN BIBLIOTECA ELECTRÓNICAH 460.7 C572cContinuing pronunciation improvementhttp://purl.org/coar/resource_type/c_2cd9