Sikorski, Roman <br/><br/>
Boolean algebras 

 - 3rd ed. 
 - New York  Springer-Verlag  1969 
 - x, 237 p. 
<br/><br/><label>ISBN: </label> DM54 
<br/><br/><label>Dewey Class. No.: </label>511.32 S29B