P. Montoya - M. Ramirez, Mcgraw Hill
$12.00
Maricarmen Paz Miranda, Atenea
$7.00
Freddy Zambrano, Atenea
$5.86
Jesus R. Torres Pertuz, Paredes
$9.26
Marcela Benassini, Prentice Hall
$20.88
Gaceta N. 40.639, la Piedra
$4.00
Dr. Ing. Harry Osers, Refolit C.a.
$12.28
Cesar Borobia, Elsevier
$29.20
Gaceta Nº 40.112, Njr
$1.00