What is mathematical logic? /
J.N. Crossley ... [et al.] 
. - London : Oxford : New York : Oxford University Press,  1972 
. - 82 p.  schem.  20 cm. 
 - (Oxford Paperbacks University Series  ; OPUS 60 )
<br/>К.: Index 
<br/><label>  ISBN: </label>0-19-888087-1