An Open University audio cassette.  [Cassettes]. 

 - Milton Keynes  Open University Educational Enterprises Ltd  1977 
<br/><br/> Notes Accompanied by a workbook shelf at T/57.6 OPE. 
<br/><br/><label>ISBN: </label> 0.00 
<br/><br/><label>Subjects--Personal Names: </label><br/>System analysis.
<br/><br/><label>Dewey Class. No.: </label>T/57.6  / OPE