Paul a Davies, Macmillan

$4.80

Prieto, Mcgraw Hill

$5.00

Jose F. Amador M., Editorial Educativa

$4.80

$17.71

Maria Latorraca, Richmond

$15.18

Dinorah Pous, Mcgraw Hill

$5.00

Michael Rost, Pearson

$4.80

Lenore Cohen, Richmond

$31.63

Judith A. Aurenty F., Actualidad Escolar 2000

$21.38

Kniveton - Llanas, Macmillan

$4.80

Vika Sadzhaya, Romor

$4.80

Kniveton - Llanas, Macmillan

$4.80

$17.71

C. Lethaby - S. Brewster, Richmond

$18.98

Hans Mol, Macmillan

$12.00