• Shashi K Gupta and Praneet Rangi(2012), “ Research Methodology”, Kalyani Publishers, New Delhi.

 

• Tripathi P C(2002), “A textbook of Research Methodoly in Social Sciences”, Sultan Chand & Sons, New Delhi.

 

• Kothari C R(2009), “Research Methodolgy-Methods and Techniques”, New Age International Publishers, New Delhi