Al-Khalili, Jim <br/><br/>
Black holes, wormholes, and time machines / 
Jim Al-Khalili 
 - 2nd ed. 
 - Boca Raton, FL :  Taylor & Francis,  c2012 
 - xxii, 184 p.  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9781439885598 1439885591 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Space and time--Popular works<br/>Cosmology--Popular works