A. T. de Perez - E. Perez, Larense
$6.00
F. Kerlinger - H. Lee, Mcgraw Hill
$43.29
Horacio Garcia Belsunce, Depalma
$9.26
Jose Peña Solis, Paredes
$10.03
J. Badillo-r. Rodriguez, Limusa Noriega Editores
$28.00
H. Koontz - H. Weihrich, Mcgraw Hill
$72.00
Marco Aurelio Alegria, el Nacional
$1.00