Dos mundos / 
Tracy D. Terrell ... [et. al.]. 
 - 4a ed. 
 - Boston :  McGraw-Hill,  1997. 
 - 540 p. :  il. ;  25 cm. 
<br/><br/><label>ISBN: </label>0070644349 
<br/><br/><label>Dewey Class. No.: </label>xxxx  / D722m