Principle of economics: M- 207:Self learning material 
Swami Vivekanand Subjarti University 
 - New Delhi, India  Laxmi Publications Pvt. ltd.   2018 
 - 217p. 
<br/><br/><br/>Distance education; Gifted by Rajeev Kumar 
<br/><br/><label>Source: </label>Textual