* Accounting for Managers - Text and Cases 
         2nd Edition
         William J. Bruns, Jr.

     * Accounting 
         19th Edition
         Warren - Reeve - Fess

    * Fundamentals of Cost Accounting 
         1st Edition
         Maher - Lanen - Rajan

     * Seminario de Costos 
         Instituto de Capacitacion y Servicios, S. C.
         C.P.C y M.A. Jorge Esquivel Muñoz