Duff, Charles,  1894-1966 <br/><br/>
How to learn a language :  a book for beginners and all others who may be interested / 
by Charles Duff 
 - Oxford :  Basil Blackwell,  1947 
 - 148 p. ;  16 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Language and languages--Study and teaching<br/>Languages, Modern--Study and teaching