Introduction to mathematical proofs : 
Roberts, Charles E., 
 - London:  CRC Press,  2009 
 - viii, 425 p. 
<br/><br/> A Chapman & Hall book." 
<br/><br/><label>ISBN: </label>9781420069556 (hardcover : alk. paper) | 1420069551 (hardcover : alk. paper)