Method, Roberston <br/><br/>
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 - Barcelona :  Ramón Sopena, S.A. :  1977 
 - 279 pág. :  16 cm . 
<br/><br/> Incluye Indice 
<br/><br/><label>ISBN: </label>84-303-0252-2 
<br/><br/><label>Dewey Class. No.: </label>420.3  / M45