Livian Navarro Caro, Panapo

$1.20

Antonio Luis Cardenas, Dasa

$4.80

$10.44

Abel Cortese, Planeta

$30.00

$10.20

$6.07

$6.07

Prof. Ramon Grau, Ediciones Grau

$7.20

H. Reichmann, Thomson

$42.00

Norman E. Gronlund, Trillas

$34.91

$10.44

A. Rubio Gil, Diaz de Santos

$33.60

$10.44

Antonio Perez Esclarin, San Pablo

$6.00

Frida Diaz Barriga Arceo, Mcgraw Hill

$36.00