Boggs, Ralph S. <br/><br/>
English Step By Step With Pictures / Ralph S. Boggs, Robert J. Dixson 

 - Estados Unidos : Regents Publishing Company, Inc. 
 - 222p. / 23 cm. 
<br/><br/><label>ISBN: </label>0-88345-416-5 
<br/><br/><label>Dewey Class. No.: </label>421.52 B233e