Wasserman, Robert David, 1945-. <br/><br/>
Theories of linguistic variation  [microform] / 
by Robert David Wasserman. 
 - Ann Arbor, Mich. :  University Microfilms International,  1976. 
 - 1 microfilm reel :  positive ;  35 mm. 
<br/><br/>Thesis (Ph.D.) - Indiana University, 1976. 
<br/><br/><label>ISBN: </label>910040599 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Language and langueges--Variation.<br/>Linguistic change.