D. Lopez - M. Rodriguez, Everest
$7.50
Gaceta Nº 40.106, Njr
$2.00
Marcela Benassini, Prentice Hall
$20.88
Oscar Pierre Tapia, Pierre Tapia
$6.00
C. Dieguez - R. Yturriaga, Mcgraw Hill
$40.00
J. Badillo-r. Rodriguez, Limusa Noriega Editores
$28.00