The Simple Book Of Not So Simple Puzzles 
S Grabarchuk , P Grabarchuk , S Grabarchuk 
 - 1 
 -  Crc  2020 
 - 119 
<br/><br/><label>ISBN: </label>9780367476236 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>793.73  / GRA