Pettersen, Duane Dennis,  1939-, <br/><br/>
A sociolinguistic study of elaborated and restricted code systems  [microform] / 
by Duane Dennis Pettersen. 
 - Ann Arbor, Mich. :  University Microfilms International,  1971. 
 - 1 microfilm reel :  positive ;  35 mm. 
<br/><br/>Thesis (Ph.D.) - Michigan State University, 1970 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sociolinguistics.