Kaedah aritmetrik mental :   secara penulisan dan kira cepat 

 - various pages ;   25 cm 
<br/><br/><label>ISBN: </label>9834155301 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic.
<br/><br/><label>Dewey Class. No.: </label>513