Parametric variation :  null subjects in minimalist theory / 
Theresa Biberauer ... [et al.]. 
 - Cambridge, UK :  Cambridge University Press,  2010. 
 - vi, 368 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9780521886956 (hbk.)  RM338.25 0521886953 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Grammar, Comparative and general--Null subject.<br/>Grammar, Comparative and general--Person.<br/>Principles and parameters (Linguistics)